CN109345926B - Portable analog digital electronic experimental equipment - Google Patents
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Abstract
The invention belongs to the technical field of electronics, and is suitable for weak current professional student experiments, practical training and technical development. In particular to portable analog digital electronic experimental equipment. The invention comprises a box body, a box cover, a circuit board, a whole machine direct current power supply, an AC9V alternating current power supply and a circuit board for converting positive and negative 12V into positive and negative 5V direct current, wherein the box body is movably connected with the box cover, buckles matched with each other are arranged on the box body and the box cover for opening and closing, a handle is arranged at one end of the box body, and box flannelette is adhered on the inner surface of the box body; the inner surface of the box cover is stuck and covered with box cover flannelette, the box cover flannelette is also connected with a containing pocket for containing scattered accessories, and the upper part in the box body is connected with a whole circuit board; the invention integrates the analog and digital electronic experiment modules, and the experiment circuit is distributed in different areas and modules, so that the invention is convenient to carry and use.
Description
Technical Field
The invention belongs to the technical field of electronics, and is suitable for weak current professional student experiments, practical training and technical development. In particular to portable analog digital electronic experimental equipment.
Background
At present, a common digital analog electronic technology experimental device has the advantages that experimental projects are selected by a single experimental template, and an analog electronic experimental box with more functions and a digital electronic experimental box with more functions are separated, so that the volume is large or the functions are simple. The assembly mode of adding a replaceable analog experiment circuit board in a digital experiment area is generally adopted. For example: model KHM-3 large-scale digital analog electronic technology experimental device.
The problems are that: (1) The experimental module is a single body, is not scattered and concentrated, has a clear panel, is loose and difficult to manage, is easy to lose and is difficult to store; (2) The common digital analog electronic technology experimental device is huge in volume and inconvenient to carry and transport, and (3) the common digital analog electronic technology experimental device is not usually in an experiment classroom when a theoretical class is explained, but the common digital analog electronic technology experimental device is huge in volume and is placed in a special laboratory, so that the digital analog electronic technology experimental device cannot be used when the theoretical class is explained, and students cannot understand teaching contents in an image; (4) The cost of the common digital analog electronic technology experimental device is relatively expensive and is basically more than 5000 yuan; (5) The current adoption increases the experimental project that the equipment mode that removable simulation experiment circuit board can be realized in digital experiment district is incomplete, can't satisfy the requirement of teaching completely.
There is currently no product that concentrates all experimental circuitry for analog and digital electronics on one panel.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide portable analog digital electronic experimental equipment. The invention integrates the analog and digital electronic experiment modules, and the experiment circuit is distributed in different areas and modules, so that the invention is convenient to carry and use.
In order to solve the technical problems, the invention adopts the technical scheme that.
The portable analog digital electronic experimental equipment comprises a box body, a box cover, a circuit board, a whole machine direct current power supply, an AC9V alternating current power supply and a circuit board for converting positive and negative 12V into positive and negative 5V direct current, wherein the box body is movably connected with the box cover, buckles matched with each other are arranged on the box body and the box cover for opening and closing, a handle is arranged at one end of the box body, and box lint is adhered to the inner surface of the box body; the novel multifunctional box is characterized in that box cover flannelette is adhered and covered on the inner surface of the box cover, a containing pocket is further connected to the box cover flannelette and used for containing scattered accessories, the upper portion of the box body is connected with a whole circuit board, a fixedly installed supporting plate arranged in the middle of the bottom of the box body is located below the circuit board and used for supporting the circuit board above, an AC9V alternating current power supply and a complete machine direct current power supply are fixedly installed on the left side and the right side of the supporting plate respectively, an AC220V complete machine alternating current power supply is installed on the upper side and the lower side of the inner side wall of the box body in a centering mode, the AC220V complete machine alternating current power supply is electrically connected with the AC9V alternating current power supply and the complete machine direct current power supply simultaneously, and the positive and negative 12V direct current power supply is electrically connected with the positive and negative 5V direct current circuit board.
The circuit board system comprises an analog electronic circuit module, a digital electronic circuit module, a measuring instrument module, a direct current power supply module and an alternating current power supply module; the distribution of the modules of the types is that the right side of the circuit board is a digital electronic circuit area, the left side of the circuit board is an analog electronic circuit area, the left side area, namely the first horizontal row of the analog electronic area, is divided into 5 modules, and the left side of the circuit board is a direct current voltmeter module, a direct current milliammeter module, a digital millivoltmeter, a common electronic element module and a bridge rectifier filter module; the left area, namely the second horizontal row of the analog electronic area, is 3 modules, namely a serial transistor voltage stabilizing source module, a field effect transistor amplifier module and an emitter follower module from left to right; the left area, namely the third horizontal row of the analog electronic area, is divided into 4 modules, namely a thyristor controllable rectifying module circuit, a TOL power amplifier module, a negative feedback amplifier module and a transistor common emitter single tube amplifier module from left to right; the left area, namely the fourth horizontal row of the analog electronic area, is divided into 4 modules, namely an RC sine wave oscillator module, a function signal generator module, an integrated operational amplifier module and a differential amplifier module from left to right; the fifth horizontal row of the left area, namely the analog electronic area, is divided into 4 modules, namely a diode half-wave rectifying, filtering and voltage stabilizing module, an integrated voltage stabilizing power module, an integrated power amplifier module and a pulse signal generator module from left to right.
The invention has the beneficial effects that:
(1) The portable analog digital electronic experimental equipment integrates analog and digital electronic experimental modules, the experimental circuit is divided into areas and the layout of the modules is divided, and an expansion development part is added. Each part modularization is very striking, is convenient for discernment and operation, accomodates the convenience, and experimental module is difficult for losing.
(2) The portable analog digital electronic experimental equipment provided by the invention is portable, is convenient for teaching, and can be used for demonstrating teaching in classrooms or practical training rooms. The invention can be used when explaining theoretical lessons, and students can understand teaching contents in an image; meanwhile, the portable multifunctional medical device is convenient to carry and use, and overcomes the defects of bulkiness and spaciousness of the original device.
(3) The cost of the portable analog digital electronic experimental equipment is about 2000-3000 yuan, and the cost of the common digital analog electronic technical experimental device is more expensive and is basically more than 5000 yuan, so that the portable analog digital electronic experimental equipment reduces the cost and has economic value.
(4) The portable analog digital electronic experimental equipment has no less than 20 digital electronic technology experiments, has no less than 20 analog electronic technology experiments, and overcomes the defects that the existing assembly mode of adding a replaceable analog experimental circuit board in a digital experimental area can realize incomplete experimental projects and cannot completely meet teaching requirements.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic diagram of the internal structure of the present invention.
FIG. 3 is a schematic diagram of the system mechanism of the present invention.
Fig. 4 is a diagram showing the distribution of the modules of the circuit board of the present invention. Since the contents of fig. 4 are very detailed, it is visually unclear and detailed description will be given with the following views.
Fig. 5 is a diagram showing the distribution of the modules of the circuit board of the present invention. Fig. 5 is a corresponding diagram to fig. 4, and fig. 5 shows the arrangement of the modules by serial numbers.
Fig. 6 is a circuit diagram of a conventional electronic component module (3-1) of the present invention.
Fig. 7 is a circuit diagram of the bridge rectifier filter module (3-2) of the present invention.
Fig. 8 is a circuit diagram of the series transistor regulated power supply module (3-3) of the present invention.
Fig. 9 is a circuit diagram of a field effect transistor amplifier module (3-4) according to the present invention.
Fig. 10 is a circuit diagram of an emitter follower module (3-5) of the present invention.
Fig. 11 is a circuit diagram of a thyristor controlled rectifier module (3-6) of the invention.
Fig. 12 is a circuit diagram of the TOL power amplifier module (3-7) of the present invention.
Fig. 13 is a circuit diagram of a negative feedback amplifier module (3-8) of the present invention.
Fig. 14 is a circuit diagram of a transistor common-emitter single-tube amplifier module (3-9) according to the present invention.
Fig. 15 is a circuit diagram of an RC sine wave oscillator module (3-10) of the present invention.
Fig. 16 is a circuit diagram of the function signal generator module (3-11) of the present invention.
Fig. 17 is a circuit diagram of an integrated operational amplifier module (3-12) of the present invention.
Fig. 18 is a circuit diagram of the differential amplifier module (3-13) of the present invention.
Fig. 19 is a circuit diagram of a diode half-wave rectifying, filtering and voltage stabilizing module (3-14) of the invention.
Fig. 20 is a circuit diagram of an integrated regulated power supply module (3-15) according to the present invention.
Fig. 21 is a circuit diagram of an integrated power amplifier module (3-16) of the present invention.
Fig. 22 is a circuit diagram of the pulse signal generator module (3-17) of the present invention.
Fig. 23 is a circuit diagram (top) of the digital circuit module (3-18) of the present invention.
Fig. 24 is a circuit diagram (in) of the digital circuit module (3-18) of the present invention.
Fig. 25 is a circuit diagram (below) of the digital circuit module (3-18) of the present invention.
Fig. 26 is a circuit diagram of the dc voltmeter module (3-19) of the present invention.
Fig. 27 is a circuit diagram of a dc milliammeter module (3-20) of the present invention.
Fig. 28 is a circuit diagram of a digital millivoltmeter (3-21) of the present invention.
In the drawing, 1 is a box body, 1-1 is a handle, 1-2 is a duckbill buckle, 1-3 is a box body flannelette, 2 is a box cover, 2-1 is a box cover flannelette, 2-2 is a storage pocket, 2-3 is a duckbill buckle, 3 is a circuit board, 3-1 is a common electronic element module, 3-2 is a bridge rectifier filter module, 3-3 is a series transistor voltage stabilizing source module, 3-4 is a field effect transistor amplifier module, 3-5 is an emitter follower module, 3-6 is a thyristor controllable rectifier module, 3-7 is a TOL power amplifier module, 3-8 is a negative feedback amplifier module, 3-9 is a transistor common emitter single tube amplifier module, 3-10 is an RC sine wave oscillator module, 3-11 is a function signal generator module, 3-12 is an integrated operational amplifier module, 3-13 is a differential amplifier module, 3-14 is a diode half-wave rectifying, filtering and voltage stabilizing module, 3-15 is an integrated voltage stabilizing power supply module, 3-16 is an integrated power amplifier module, 3-17 is a pulse signal generator module, 3-18 is a digital circuit module, 3-19 is a direct current voltmeter module, 3-20 is a direct current milliamp meter module, 3-21 is a digital millivolt meter, 4 is an aluminum framework, 5 is a direct current power supply of the whole machine, 6 is an alternating current power supply of AC9V, 7 is a circuit board for converting positive and negative 12V into positive and negative 5V, 8 is a supporting plate, and 9 is an alternating current power supply AC220V of the whole machine.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are merely intended to illustrate further features and advantages of the invention, and are not limiting of the claims of the invention.
According to the results of fig. 1 and 2, the whole structure of the invention comprises a box body 1, a box cover 2, a circuit board 3, a whole machine direct current power supply 5, an AC9V alternating current power supply 6 and a positive-negative 12V-to-positive 5V direct current circuit board 7, wherein the box body 1 is hinged with the box cover 2, a handle 1-1 is arranged on the front side surface of the outer wall of the box body 1 through bolts, two duckbill buckle female buckles 1-2 are respectively arranged on the two sides of the handle 1-1 through bolts on the front side surface of the outer wall of the box body 1, and box flannelette 1-3 is adhered on the inner surface of the box body 1; the inner surface of the box cover 2 is adhered and covered with a box cover flannelette 2-1, the box cover flannelette 2-1 is also connected with a containing pocket 2-2 for containing scattered accessories, 2 duckbill buckles 2-3 are connected to the front side surface of the outer surface of the box cover 2 through bolts, the 2 duckbill buckles 2-3 are respectively matched with the 2 duckbill buckle female buckles 1-2 for buckling, the upper part of the inner peripheral wall of the box body 1 is designed to be slightly convex and used for placing bolts to connect with a whole circuit board 3, a fixed mounting support plate 8 at the middle position in the box body 1 is positioned below the circuit board 3 and used for supporting the circuit board 3 above, an AC9V alternating current power supply 6 and a whole machine direct current power supply 5 are respectively and fixedly mounted on the left and right sides of the support plate 8, a whole machine alternating current power supply AC220V9 is mounted on the upper and lower middle of the side wall of the box body, the whole machine alternating current power supply AC220V9 is simultaneously electrically connected with the AC9V alternating current power supply 6 and the whole machine direct current power supply 5, and the whole machine direct current power supply 5 is electrically connected with a positive and negative 12V direct current circuit 7; the alternating current power supply 6 outputs AC9V to the circuit board 3; the positive and negative 12V-to-positive-to-negative 5V direct current circuit board 7 outputs positive and negative 12V and positive and negative 5V to the circuit board 3; the edges and corners of the box body 1 and the box cover 2 are covered and provided with an aluminum framework 4 for protecting the box body from abrasion.
As can be seen from fig. 3, the system of the present invention is composed of an analog electronic circuit module, a digital electronic circuit module, a measuring instrument module, a dc power module, and an ac power module. The measuring instrument module mainly provides measuring service for the analog electronic circuit module, the direct current power supply module simultaneously provides power supply service for the analog electronic circuit module and the digital electronic circuit module, and the alternating current power supply module provides alternating current service for the analog electronic circuit module.
According to fig. 4 and 5, the overall distribution of the circuit board of the present invention is shown in fig. 5, where the module distribution in fig. 4 is corresponding to the numbers 3-1 to 3-21, the right side of the circuit board of the present invention is a digital electronic circuit area 3-18, the left side is an analog electronic circuit area, the left side area is a first horizontal row of the analog electronic area and is divided into 5 modules, and the left side is a direct current voltmeter module 3-19, a direct current milliamp meter module 3-20, a digital milliamp meter 3-21, a common electronic component module 3-1 and a bridge rectifying and filtering module 3-2 from left to right; the left area, namely the second horizontal row of the analog electronic area, is 3 modules, namely a serial transistor voltage stabilizing source module 3-3, a field effect transistor amplifier module 3-4 and an emitter follower module 3-5 from left to right; the left area, namely the third horizontal row of the analog electronic area, is divided into 4 modules, namely a thyristor controllable rectifying module 3-6 circuit diagram, a TOL power amplifier module 3-7, a negative feedback amplifier module 3-8 and a transistor common emitter single tube amplifier module 3-9 from left to right; the left area, namely the fourth horizontal row of the analog electronic area, is divided into 4 modules, namely an RC sine wave oscillator module 3-10, a function signal generator module 3-11, an integrated operational amplifier module 3-12 and a differential amplifier module 3-13 from left to right; the fifth horizontal row of the left area, namely the analog electronic area, is divided into 4 modules, namely a diode half-wave rectifying and filtering voltage stabilizing module 3-14, an integrated voltage stabilizing power supply module 3-15, an integrated power amplifier module 3-16 and a pulse signal generator module 3-17 from left to right.
As can be seen from the circuit diagram of the common electronic component module (3-1) in fig. 6, the common electronic component module is composed of Q1, Q2, Q3, Q4, LED1, LED2, C1, C2, C3, C4, D1, D2, R1, R2, R3, R4, thereby forming a common electronic component group, providing common electronic components for detection, measurement, identification and recognition, and for multimeter measurement.
As can be seen from the circuit diagram of the bridge rectifier filter module (3-2) in FIG. 7, the bridge rectifier filter module is composed of an alternating current 9V, rectifier bridges D11-D14, a filter capacitor C42, a protection resistor R99, and loads R127 and R128. The output of the rectifier bridges D11-D14 are connected in series with the protection resistor R99 and then connected in series with the loads R127 and R128. The alternating current 9V provides input voltage for the rectifier bridges D11-D14, the filter capacitor C42 filters pulsating direct current output by the rectifier bridges to obtain direct current voltage, the protection resistor R99 is connected in series in an output loop to prevent short circuit, other elements are burnt out, the loads R127 and R128 are used for detecting carrying capacity and the like, the circuit module can complete full-wave rectification and capacitive filter functions, can know carrying, no-load and short-circuit output voltage, and calculates a voltage stabilizing coefficient and an output resistor.
According to the circuit diagram of the series transistor voltage stabilizing source module (3-3) shown in fig. 8, the series transistor voltage stabilizing source module is composed of a filter capacitor C43, a voltage regulating circuit, an overcurrent protection circuit, a reference circuit, a sampling circuit, a power filter capacitor C44 and a load circuit, so that the series transistor voltage stabilizing function is realized. The input of the positive end of the filter capacitor C43 is connected with the negative end of the power supply and grounded, ripple waves of input voltage are filtered, the voltage regulating circuits W14 and R104 are connected in series to provide voltages for the Q18 and Q19, base currents of the regulating tubes are changed by the voltage regulating circuits W14, R104, Q18 and Q19 to control the control capacity of the regulating tubes, one section of the current sampling resistor R100 is connected with the other end of the emitter of the regulating tube Q18 and is connected with the output end of the emitter of the regulating tube Q18, the voltage is divided into the base of the Q20 in series by the R101 and the R106 to prevent the output current from being excessively burnt out, the standard circuit is connected with ZW1 in series to provide a standard voltage by the R102, the sampling circuit R103 is connected with the W15 and the R107 in series, the base of the potentiometer W15 is used for sampling the output voltage to control the base currents of the regulating tubes to achieve the purpose of controlling the output voltage, the positive end of the power supply filter capacitor C44 is connected with the negative end of the output end to be grounded again filtered to obtain a stable direct current voltage, the load capacity is formed by connecting the W16 and the R105 in series to detect load capacity and the like.
According to the circuit diagram of the field effect transistor amplifier module (3-4) in fig. 9, the circuit diagram is composed of an input capacitor, a bias resistor, an output capacitor, a bypass capacitor and a load, so that the function of the field effect transistor amplifier circuit is realized. One end of the input capacitor C17 is connected with a signal source, the other end of the input capacitor C is connected with a grid electrode of the field effect tube, the bias resistor W5 and the bias resistor R41 are connected in series and are respectively connected with the grid electrode of the Q9 through a pressure joint R39, the source electrode and the drain electrode of the Q9 through a pressure joint R37 and a pressure joint R42, one end of the bypass capacitor C18 is connected with the drain electrode of the Q9, the other end of the bypass capacitor C is grounded, the amplification function of the field effect tube Q9 is realized, and the load is formed by connecting the output capacitor C16 and the output capacitor R40 in series.
As can be seen from the circuit diagram of the emitter follower module (3-5) in FIG. 10, the emitter follower function is completed by the input loop, the bias loop, the output loop and the Q6 amplifier loop. The input loop is formed by connecting a signal source with C8 in series to form an input loop, an input signal is provided for the base electrode of the amplifier Q6, W2 and R19 are connected in series, R21 is connected with the emitter electrode of the Q6 to form a bias circuit, a power supply provides static voltage for the amplifier to ensure that the amplifier works in an amplifying region, C9 and R22 are connected in series to form an output loop for detecting the carrying capacity and the like, and the Q6 amplifier loop amplifies the input signal.
According to the circuit diagram of the thyristor controllable rectifying module (3-6) shown in fig. 11, the thyristor controllable rectifying module is composed of an alternating current power supply AC9V, a full-wave rectifying circuit, a voltage stabilizing circuit, a triggering circuit and an output circuit, and the thyristor controllable rectifying function is completed. AC9V is connected with full-wave rectification circuits D6, D7, D9 and D10 in series to provide AC voltage, a voltage stabilizing circuit is connected with D8 in series by R95 to complete voltage stabilizing function, a direct current working power supply is provided for a next-stage circuit, a trigger circuit W12 is connected with R97 and C41 in series to charge C41 and is connected with an E end of T1, R96 and R98 are respectively connected with b1 and b2 ends of T1 to form a spike generating circuit, b2 is connected with a G end given by T2 to trigger a silicon controlled rectifier, and an output circuit is connected with an A end of T2 in series by R94 and DS16 to detect carrying capacity and the like.
According to the TOL power amplifier module (3-7) circuit diagram of FIG. 12, the power amplification function is completed by an input loop, a bias circuit, a bootstrap circuit, a push-pull circuit and an output loop. The input loop is formed by connecting an input low-frequency signal to the base electrode of a push triode through a C32, the bootstrap circuit is formed by connecting R83, W12, R86 and C30 in series, the voltage of a capacitor C30 is used for continuously maintaining power supply, the push circuit is formed by connecting R86 and R87 in series and dividing the voltage to the base electrode of Q17 to provide bias voltage, R88 and C33 are connected in parallel, the input small signal is amplified to push an amplifier of a later stage, the output loop is connected in series with a D5 and a W11 to eliminate crossover distortion, one end of R84 is connected with the base electrode of R83, the other end is connected with the base electrode of Q15 to provide bias voltage, the emitter of Q15 is connected with the collector of Q16 to form a pair of tubes and is connected with the positive electrode of C31 to form an output loop, and the output is connected with a 8 ohm loudspeaker to detect load capacity and the like.
According to the circuit diagram of the negative feedback amplifier module (3-8) shown in fig. 13, the negative feedback amplifier module is composed of an input loop, a front-stage amplifier, a rear-stage amplifier, a negative feedback circuit and an output circuit, and the negative feedback amplification function is completed. The input loop is formed by connecting R27 and C12 in series and connecting with a front-stage amplifier Q7, the signal of the signal source is sent to the front-stage amplifier, the front-stage amplifier is a basic single-tube amplifier formed by W4, R25, R26, R23, C10, R32, R34 and C13, the front-stage amplifier amplifies the signal in one stage and then sends the signal to a rear-stage amplifier formed by C10, the rear-stage amplifier is a basic common-emitter single-tube amplifier formed by W3, R26, R30, R24, Q8, R35 and C14, the front-stage signal is amplified again, the R36 and C15 are connected in series to form a negative feedback circuit, the output signal of the rear-stage is fed back to the emitter of the front-stage method Q7 in a negative feedback mode to inhibit the output signal, the signal quality is improved, and the output circuit is formed by connecting C11 and R33 in series for detecting the carrying capacity and the like.
As can be seen from the circuit diagram of the transistor common-emitter single-tube amplifier module (3-9) in fig. 14, the transistor common-emitter single-tube amplifier module is composed of an input circuit, a bias circuit, an amplifier and an output circuit, and the transistor common-emitter single-tube amplifier function is completed. An input circuit is formed by connecting R14 and C6 in series, a signal of a signal source is sent to a base electrode of a triode Q5 from an anode of a capacitor C6, an upper bias resistor of the Q5 is formed by connecting W1 and R13 in series, a lower bias resistor of the Q5 is formed by grounding R15, a collector electrode of the Q5 is connected to a power supply through R12, an emitter electrode of the Q5 is grounded through R16, C7 is a bypass capacitor, and an output circuit is formed by connecting the collector electrode of the Q5 with C6 and R17 so as to detect load capacity and the like.
According to the circuit diagram of the sine wave oscillator module (3-10) shown in fig. 15 and RC, the RC oscillation function is completed by the frequency-selecting network, the positive feedback circuit, the negative feedback circuit, the basic amplifying circuit and the output circuit. R55 and C19 or R62 and C20, C24 and C26 are connected in parallel and then connected in series to form a frequency selection network, C22 and the frequency selection network are connected in series to form a positive feedback circuit, an output signal is fed back to the base electrode of a previous stage amplifier Q13 from C23, W7 and R56 are connected in series to form a negative feedback circuit, the output signal is fed back to the emitter electrode of the previous stage amplifier Q13 so as to control the output amplitude of the amplifier, and a two-stage basic amplifying circuit consisting of C23, R57, R63, R58, R64, R59, R65, R66, C21, C25, Q13 and Q14 is used for amplifying sine wave signals, and the collector electrode of a triode Q14 is connected with C22 to form an output circuit for detecting load capacity and the like.
As can be seen from the circuit diagram of the function signal generator module (3-11) of FIG. 16, the function signal generator module is composed of an integrated circuit MAX038 chip, a waveform selection circuit, a frequency trimming circuit and a waveform output circuit. And the function signal generator function of sine wave, triangular wave and square wave generation is completed. The 3-pin A0 and the 4-pin A1 of the chip MAX038 are connected to the K33 waveform selection switch to form a waveform selection circuit, a sine wave is output when A1=1, a triangular wave is output when A0=0 and A1=1, a square wave is output when A0=1 and A1=0, the 5-pin C57 or C58, C59, C60, C62, C63 and C64 of the chip MAX038 form a frequency selection circuit, the 1-pin of MAX038 is connected to the 10-pin through W19 and R123 in series to form a frequency trimming circuit, the output frequency is trimmed, and the 19-pin output of MAX038 is connected to the R124 and R125 to form a waveform circuit for detecting the load capacity and the like.
As can be seen from the circuit diagram of the integrated operational amplifier module (3-12) of fig. 17, the integrated operational amplifier module is composed of a direct current signal source circuit, an operational amplifier chip ua741, an integrating circuit, a differentiating circuit, an inverse proportion operation circuit and an addition and subtraction operation circuit. The method is used for completing the operation function of the integrated operational amplifier. The other end of R71 is connected with +12V power supply, the other end is connected with-12V, the position of sliding end of R76 is changed to output positive and negative voltage and zero voltage, one end of R72 is connected with +12V power supply, the other end is connected with W19 and R77 in series, the other end of R77 is connected with-12V, the position of sliding end of W9 is changed to output positive and negative voltage and zero voltage, a direct current signal source is formed, one end of R75 is connected with input signal, the other end is connected with 2 pins of ua741 chip, C28 feeds back output voltage to 2 pins to form an integrating circuit, one end of R75 is connected with input signal, the other end is connected with 2 pins of ua741 chip, C29 feeds back output voltage to 2 pins to form a differentiating circuit, the other ends of R67 and R69 are respectively connected with the output end of the direct current signal source and the 2 pins of ua741 chip, one end of R68 and two ends of R70 are connected with 2 pins of ua741 chip, and the other ends of R75 are connected with 6 pins to form an addition and subtraction operation circuit.
As can be seen from the circuit diagram of the differential amplifier module (3-13) in fig. 18, the differential amplifier module is composed of an input circuit, an output circuit, a typical differential amplifier, and a constant current source differential amplifier, and performs a differential amplification function. One end of R46 is connected with the base electrode of Q11, the other end is connected with input signals Ui1 and R48, the other end of R48 is connected with the base electrode of Q10, the other end is connected with R51 and the other ends of input signals Ui2 and R51 to form an input circuit. One ends of R43 and R44 are connected with a power supply +12V, the other ends are respectively connected with collectors of Q11 and Q10 and outputs Uo1 and Uo2 of the differential amplifier to form an output circuit, a sliding end of W6 is connected with R52 through K8 to form a typical differential amplifier circuit, and a sliding end of W6 is connected with a collector of Q12 through K8 to form a constant-current source differential amplifier.
According to the circuit diagram of the diode half-wave rectifying, filtering and voltage stabilizing module (3-14) shown in fig. 19, the circuit diagram consists of an alternating current power supply, a half-wave rectifying circuit, a filtering circuit and a voltage stabilizing circuit, and the half-wave rectifying, filtering and voltage stabilizing functions are completed. The AC connection end of the AC power supply is respectively connected with the positive electrode of the half-wave rectifying diode D22 and the ground to form a half-wave rectifying circuit, one end of the filter capacitor C65 is connected with the other end of the negative electrode of the diode D22 to form a filter circuit, one end of the R9 is connected with the other end of the negative electrode of the diode D22 to be connected with the negative electrode of the DZ1, and the positive electrode of the DZ1 is grounded to form a voltage stabilizing circuit to provide direct current output.
According to the circuit diagram of the integrated voltage-stabilized power supply module (3-15) shown in fig. 20, the integrated voltage-stabilized power supply is composed of a voltage-stabilized chip 78LM05 and a filter circuit. One end of the filter capacitor C45 and C47 is connected with the input Ui, namely the 1 pin of the voltage stabilizing chip, the other end of the filter capacitor C48 and C46 is connected with the input Uo, namely the 3 pin of the voltage stabilizing chip, and the other end of the filter capacitor C46 is Grounded (GND) to form a filter circuit. The input and output circuits are filtered.
As can be seen from the circuit diagram of the integrated power amplifier module (3-16) in fig. 21, the integrated power amplifier module is composed of an input circuit, an integrated power amplifier chip, a filter circuit and an output circuit. And the integrated power amplification function is completed. The 6 and 7 pins of the integrated amplifying chip TDA2822M are respectively connected with R92, R89, uiL and UiR to form an input circuit, the anodes of the filter capacitors C39 and C38 are respectively connected with the 5 and 8 pins of the integrated amplifying chip TDA2822M, the cathodes of the filter capacitors C34 and C37 are grounded, the anodes of the filter capacitors C34 and C37 are respectively connected with the 1 and 3 pins of the integrated amplifying chip TDA2822M, the cathodes of the filter capacitors C36 and C40 are respectively connected with the output ends of UoL and UoR, the filter capacitors C36 and C40 are respectively connected with R91 and R92 in series, the other ends of the R91 and R92 are grounded to filter high-frequency signals to form an output circuit.
According to the circuit diagram of the pulse signal generator module (3-17) shown in FIG. 22, the pulse signal generator module consists of a time base chip NE555, a 1KHz frequency selection circuit, a 1Hz frequency selection circuit and a frequency output circuit. The 1KHz frequency selection circuit completes the pulse frequency generation function of 1KHz and 1 Hz. R109, one end connects power +5V, the other end connects 7 feet of time base chip NE555 and the other end connects C50 to ground of positive pole of R108 and D15, 1KHz frequency selective circuit, R109, one end connects power +5V, the other end connects 7 feet of time base chip NE555 and the other end connects K, C to ground of positive pole of R108 and D15 to form 2Hz frequency selective circuit, make the output signal 2Hz.
As can be seen from the circuit diagrams of the integrated digital circuit modules (3-18) combined in fig. 23, 24 and 25, the integrated circuit module is composed of a power supply section, a display circuit, an integrated block expansion section, a logic level display mode circuit, a single pulse circuit, and a logic comment input circuit. The top is a power supply part, a flag-down mode display circuit, an integrated block expansion part, standby expansion COM ends are arranged on the left and right sides of the expansion part, a logic level display mode circuit is arranged below the integrated block expansion part, a single pulse circuit is arranged below the integrated block expansion part, and a logic comment input circuit is arranged below the integrated block expansion part. The digital electronic technology experiment training function is formed. The power supply part is composed of +12V, -12V, +5V and-5V, AC V to provide the required direct current and alternating current voltage for the positive plate.
As can be seen from the circuit diagram of the dc voltmeter module (3-19) of fig. 26, the function is to measure the dc supply voltage and the respective quiescent operating point voltages.
As can be seen from the circuit diagram of the dc milliammeter modules (3-20) of fig. 27, the function is to measure the current at each quiescent operating point.
From the circuit diagram of the digital millivoltmeter (3-21) of fig. 28, its function is to measure the input and output voltages of the ac amplifier.
The existing large digital analog electronic technology experimental device with the model of KHM-3 is provided with 5 types of experimental devices, namely a negative feedback amplifying circuit, an RC oscillator, a power amplifier, an emitter follower and a differential amplifier; the experimental types of the invention are not less than 20 analog electronic technology experiments, and the common electronic element identification and detection, bridge rectification filtering voltage stabilization, serial transistor voltage stabilization source, field effect transistor amplifier, emitter follower, thyristor controllable rectification circuit, TOL power amplifier circuit, negative feedback amplifier circuit, transistor common emitter single tube amplifier circuit, RC sine wave oscillator circuit, function signal generator circuit and integrated operational amplifier circuit can be used for 5 functional experiments, differential amplifier circuit, diode half-wave rectification filtering voltage stabilization circuit, integrated voltage stabilization power supply circuit, integrated power amplifier circuit and pulse signal generator circuit.
The digital electronic technology experiment of the invention is not less than 20, including the parameter test of AND, OR, NOT, TTL integrated logic gate, the parameter test of CMOS integrated logic gate, the connection and drive of integrated logic circuit, adder, decoder and application thereof, the design and test of combined logic circuit, data selector, trigger, shift register and application thereof, counter, integrated timer, pulse distributor and application thereof, monostable trigger and Schmitt trigger, pulse delay and waveform shaping circuit, the generation of pulse signal by using gate circuit-self-excited multivibrator, digital frequency meter, D/A, A/D converter, comprehensive experiment-intelligent competition answering device, electronic stopwatch, comprehensive experiment-3-bit semi-direct current digital voltmeter 74. The experimental device has the advantages of convenient operation, clear modules, small size, convenience, portability and the like in the specific operation of experiments.
It should be understood that the foregoing detailed description of the present invention is provided for illustration only and is not limited to the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention may be modified or substituted for the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (1)
1. A portable analog digital electronic experimental device, characterized in that: the novel multifunctional electric box comprises a box body, a box cover, a circuit board, a whole machine direct current power supply, an AC9V alternating current power supply and a circuit board for converting positive and negative 12V into positive and negative 5V direct current, wherein the box body is movably connected with the box cover, buckles matched with each other are arranged on the box body and the box cover for opening and closing, a handle is arranged at one end of the box body, and box flannelette is adhered on the inner surface of the box body; the novel multifunctional box is characterized in that box cover flannelette is adhered and covered on the inner surface of the box cover, a containing pocket is further connected to the box cover flannelette and used for containing scattered accessories, the upper portion of the box body is connected with a whole circuit board, a fixedly installed supporting plate is arranged in the middle of the bottom of the box body and is positioned below the circuit board and used for supporting the circuit board above, an AC9V alternating current power supply and a complete machine direct current power supply are fixedly installed on the left side and the right side of the supporting plate respectively, an AC220V complete machine alternating current power supply is installed on the upper side and the lower side of the inner side wall of the box body in the middle, the AC220V complete machine alternating current power supply is electrically connected with the AC9V alternating current power supply and the complete machine direct current power supply at the same time, the complete machine direct current power supply is electrically connected with a positive and negative 12V to positive and negative 5V direct current circuit board, and the AC9V is output to the circuit board; the positive and negative 12V-to-positive-to-negative 5V direct current circuit board outputs positive and negative 12V and positive and negative 5V to the circuit board;
the circuit board system comprises an analog electronic circuit module, a digital electronic circuit module, a measuring instrument module, a direct current power supply module and an alternating current power supply module; the distribution of the modules of the types is that the right side of the circuit board is a digital electronic circuit area, the left side of the circuit board is an analog electronic circuit area, the left side area, namely the first horizontal row of the analog electronic area, is divided into 5 modules, and the left side of the circuit board is a direct current voltmeter module, a direct current milliammeter module, a digital millivoltmeter, a common electronic element module and a bridge rectifier filter module; the left area, namely the second horizontal row of the analog electronic area, is 3 modules, namely a serial transistor voltage stabilizing source module, a field effect transistor amplifier module and an emitter follower module from left to right; the left area, namely the third horizontal row of the analog electronic area, is divided into 4 modules, namely a thyristor controllable rectifying module circuit, a TOL power amplifier module, a negative feedback amplifier module and a transistor common emitter single tube amplifier module from left to right; the left area, namely the fourth horizontal row of the analog electronic area, is divided into 4 modules, namely an RC sine wave oscillator module, a function signal generator module, an integrated operational amplifier module and a differential amplifier module from left to right; the left area, namely the fifth horizontal row of the analog electronic area, is divided into 4 modules, namely a diode half-wave rectifying, filtering and voltage stabilizing module, an integrated voltage stabilizing power module, an integrated power amplifier module and a pulse signal generator module from left to right;
the bridge type rectifying and filtering module consists of alternating current 9V, rectifying bridges D11-D14, a filtering capacitor C42, a protection resistor R99, loads R127 and R128, wherein the outputs of the rectifying bridges D11-D14 are connected with the protection resistor R99 in series and then connected with the loads R127 and R128 in series; the alternating current 9V provides input voltage for the rectifier bridges D11-D14, the filter capacitor C42 filters pulsating direct current output by the rectifier bridges to obtain direct current voltage, the protection resistor R99 is connected in series in an output loop to prevent short circuit and burn out other elements, and the loads R127 and R128 are used for detecting the load capacity;
the series transistor voltage stabilizing source module consists of a filter capacitor C43, a voltage regulating circuit, an overcurrent protection circuit, a reference circuit, a sampling circuit, a power supply filter capacitor C44 and a load circuit, the series transistor voltage stabilizing function is realized, the positive end input of the filter capacitor C43 is connected with the negative end of the power supply to be grounded, ripple waves of input voltage are filtered, the voltage regulating circuits W14 and R104 are connected in series to provide voltages for Q18 and Q19, the base currents of the regulating tubes are changed by the voltage regulating circuits W14, R104, Q18 and Q19 to control the control capacity of the regulating tubes, one section of a current sampling resistor R100 is connected with the other end of the emitter of the regulating tube Q18 to be output, the R101 and R106 are connected in series to divide the voltage to the base of the Q20 to prevent the excessive burning of other components caused by output short circuit, the reference circuit is connected in series with the ZW1 by R102, the sampling circuit R103 is connected in series with the W15 and R107, the output voltage is sampled by the base of the sliding end of the potentiometer W15 to control the base of the output voltage, the base currents of the regulating tubes are controlled to achieve the purpose of controlling the output voltage, the output voltage is controlled by the base currents of the regulating tubes, the filter capacitor C44 is connected in series to be stable, the load voltage is connected with the load circuit R105 again, and the load circuit is connected with the load-connected with the load circuit to be detected;
the field effect transistor amplifier module is composed of an input capacitor, a bias resistor, an output capacitor, a bypass capacitor and a load, so that the function of a field effect transistor amplifier circuit is realized, one end of the input capacitor C17 is connected with a signal source, the other end of the input capacitor C is connected with a field effect transistor grid electrode, the bias resistor W5 and the R41 are connected in series and are respectively connected with a Q9 grid electrode, the R37 and the R42 are respectively connected with a source electrode and a drain electrode of the Q9 in a crimping way, one end of the bypass capacitor C18 is connected with the drain electrode of the Q9, the other end of the bypass capacitor C18 is grounded, the field effect transistor Q9 is amplified, and the load is composed of the output capacitor C16 and the R40 which are connected in series;
the emitter follower module is composed of an input loop, a bias loop, an output loop and a Q6 amplifier loop, the input loop is formed by connecting a signal source in series through R20 and C8 to form an input loop, an input signal is provided for a base electrode of the amplifier Q6, W2 and R19 are connected in series, R21 is connected with an emitter electrode of the Q6 to form a bias loop, a power supply provides static voltage for the amplifier to ensure that the amplifier works in an amplifying area, C9 and R22 are connected in series to form an output loop for detecting the load capacity, and the Q6 amplifier loop amplifies the input signal;
the thyristor controllable rectifying module is composed of an alternating current power supply AC9V, a full-wave rectifying circuit, a voltage stabilizing circuit, a triggering circuit and an output circuit, the transistor controllable rectifying function is completed, the alternating current power supply AC9V is connected with the full-wave rectifying circuits D6, D7, D9 and D10 in series to provide alternating current voltage, the voltage stabilizing circuit is connected with the D8 in series to complete the voltage stabilizing function by the R95, a direct current working power supply is provided for a subsequent circuit, the triggering circuit W12 is connected with the R97 and the C41 in series to charge the C41 and is connected with the E end of the T1, the R96 and the R98 are respectively connected with the b1 and the b2 end of the T1 to form a sharp pulse generating circuit, the b2 is connected with the G end given by the T2 to trigger the silicon controlled rectifier, and the output circuit R94 is connected with the DS16 in series to the A end of the T2 to detect the carrying capacity;
the TOL power amplifier module is composed of an input loop, a bias circuit, a bootstrap circuit, a pushing circuit, a push-pull circuit and an output loop, wherein the input loop is formed by connecting an input low-frequency signal to a base electrode of a push triode through C32, the bootstrap circuit is formed by connecting R83, W12, R86 and C30 in series, the voltage of a capacitor C30 is utilized to continuously maintain power supply, the pushing circuit is formed by connecting R86 and R87 in series and dividing the voltage to provide bias voltage for a base electrode of Q17, R88 and C33 are connected in parallel, the input small signal is amplified to push an amplifier of a later stage, the output loop is connected in series by D5 and W11 to eliminate crossover distortion, one end of R84 is connected with a base electrode of Q15 to provide bias voltage, an emitter of Q15 is connected with a collector electrode of Q16 to form a pair of pipe and is connected with the C31 at the same time to form the output loop, and the output is connected with a 8 ohm loudspeaker to detect the load capacity;
the negative feedback amplifier module is composed of an input loop, a front-stage amplifier, a rear-stage amplifier, a negative feedback circuit and an output circuit, the negative feedback amplification function is completed, the input loop is composed of R27 and C12 which are connected in series and are connected with a front-stage amplifier Q7, a signal of a signal source is sent to the front-stage amplifier, the front-stage amplifier is a basic single-tube amplifier composed of W4, R25, R26, R23, C10, R32, R34 and C13, the front-stage amplifier amplifies the signal in one stage and then sends the signal to the rear-stage amplifier by C10, the rear-stage amplifier is composed of W3, R26, R30, R24, Q8, R35 and C14 which are connected in series and form a negative feedback circuit, the output signal of the rear-stage is fed back to the emitter of the front-stage amplifier Q7 in a negative feedback mode so as to inhibit the size of the output signal, and the output circuit is composed of C11 and R33 which are connected in series and are used for detecting the carrying capacity;
the transistor common emitter single tube amplifier module is composed of an input circuit, a bias circuit, an amplifier and an output circuit, the function of the transistor common emitter single tube amplifier is completed, the input circuit is composed of R14 and C6 which are connected in series, a signal of a signal source is sent to a base electrode of a triode Q5 from an anode of a capacitor C6, an upper bias resistor of Q5 is composed of W1 and R13 which are connected in series, R15 is grounded to form a lower bias resistor of Q5, a collector electrode of Q5 is connected to a power supply through R12, an emitter electrode of Q5 is grounded through R16, C7 is a bypass capacitor, and the output circuit is composed of a collector electrode of Q5, C6 and R17 so as to detect the load capacity;
the RC sine wave oscillator module is composed of a frequency selection network, a positive feedback circuit, a negative feedback circuit, a basic amplifying circuit and an output circuit, wherein the RC oscillation wave oscillation function is completed, R55 and C19 or after being connected in series, R62, C20, C24 and C26 are connected in parallel and then connected in series to form the frequency selection network, C22 and the selection network are connected in series to form the positive feedback circuit, an output signal is fed back to the base electrode of a previous-stage amplifier Q13 by C23, W7 and R56 are connected in series to form the negative feedback circuit, the output signal is fed back to the emitter electrode of the previous-stage amplifier Q13 so as to control the output amplitude of the amplifier, the two-stage basic amplifying circuit composed of C23, R57, R63, R58, R64, R59, R65, R66, C21, C25, Q13 and Q14 amplifies sine wave signals, and the collector electrode of a triode Q14 is connected with C22 to form the output circuit so as to detect the load capacity;
the function signal generator module consists of an integrated circuit MAX038 chip, a waveform selection circuit, a frequency fine tuning circuit and a waveform output circuit; the function signal generator functions of sine wave, triangular wave and square wave generation are completed, 3 feet A0 and 4 feet A1 of a chip MAX038 are connected to a K33 waveform selection switch to form a waveform selection circuit, sine waves are output when A1=1, triangular waves are output when A0=0 and A1=1, square waves are output when A0=1 and A1=0, 5 feet C57 or C58, C59, C60, C62, C63 and C64 of MAX038 form a frequency selection circuit, 1 foot of MAX038 is connected to 10 feet in series through W19 and R123 to form a frequency trimming circuit, the output frequency is trimmed, 19 feet output of MAX038 are connected to R124 and R125 to form a waveform circuit, and the frequency trimming circuit is used for detecting load capacity;
the integrated operational amplifier module consists of a direct current signal source circuit, an operational amplifier chip ua741, an integrating circuit, a differentiating circuit, an inverse proportion operational circuit and an addition and subtraction operational circuit, and is used for completing the operational function of the integrated operational amplifier, wherein one end of R71 is connected with the other end of +12V power supply and is connected with W10 and R76 in series, the other end of R76 is connected with-12V, the position of the sliding end of W10 is changed to output positive and negative voltage and zero voltage, one end of R72 is connected with the other end of +12V power supply and is connected with W19 and R77 in series, the other end of R77 is connected with-12V, the position of the sliding end of W9 is changed to output positive and negative voltage and zero voltage, a direct current signal source is formed, one end of R75 is connected with the other end of input signal and is connected with the 2 pin of ua741 chip, C28 feeds the output voltage back to the 2 pin of the ua741 chip, the other end of R75 is connected with the 2 pin of the input signal, C29 feeds the output voltage back to the 2 pin of the ua741 chip to form a differentiating circuit, the other end of R67 and R69 is respectively connected with the other end of the output end of the direct current signal source and the 2 pin of the R68 and the two ends of the subtracting circuit are connected with one end of R70 and the two ends of the subtracting circuit;
the differential amplifier module is composed of an input circuit, an output circuit, a typical differential amplifier and a constant current source differential amplifier, and is used for completing the differential amplification function, wherein one end of R46 is connected with the base electrode of Q11, the other end of R48 is connected with the input signals Ui1 and R48, the other end of R48 is grounded, one end of R50 is connected with the base electrode of Q10, and the other end of R51 is connected with the input signals Ui2 and the other end of R51 is grounded to form an input circuit; one ends of R43 and R44 are connected with a power supply +12V, the other ends are respectively connected with collectors of Q11 and Q10 and outputs Uo1 and Uo2 of the differential amplifier to form an output circuit, a sliding end of W6 is connected with R52 through K8 to form a typical differential amplifier circuit, and a sliding end of W6 is connected with a collector of Q12 through K8 to form a constant-current source differential amplifier;
the diode half-wave rectification filtering voltage stabilizing module consists of an alternating current power supply, a half-wave rectification circuit, a filtering circuit and a voltage stabilizing circuit, the half-wave rectification filtering voltage stabilizing function is completed, the AC connecting end of the alternating current power supply is respectively connected with the positive electrode of a half-wave rectification diode D22 and the ground to form the half-wave rectification circuit, one end of a filtering capacitor C65 is connected with the other end of the negative electrode of the diode D22 to be grounded to form the filtering circuit, one end of a R9 is connected with the negative electrode of the diode D22, the other end of the negative electrode of the diode D22 is connected with the negative electrode of a DZ1, and the positive electrode of the DZ1 is grounded to form the voltage stabilizing circuit to provide direct current output;
the circuit diagram of the integrated voltage-stabilizing power supply module (3-15) can be known to be composed of a voltage-stabilizing chip 78LM05 and a filter circuit, the integrated voltage-stabilizing power supply working energy is completed, one end of a filter capacitor C45 and one end of a filter capacitor C47 are connected with an input Ui, namely a1 pin of the voltage-stabilizing chip, the other end of the filter capacitor C48 and one end of the filter capacitor C46 are Grounded (GND), one end of the filter capacitor C48 and one end of the filter capacitor C46 are connected with an input Uo, namely a 3 pin of the voltage-stabilizing chip, and the other end of the filter capacitor C48 and the other end of the filter capacitor C46 are Grounded (GND) to form the filter circuit; filtering the input and output circuits;
the integrated power amplifier module consists of an input circuit, an integrated power amplifier chip, a filter circuit and an output circuit; completing the function of integrated power amplification; the 6 and 7 pins of the integrated amplifying chip TDA2822M are respectively connected with R92, R89, uiL and UiR to form an input circuit, the anodes of the filter capacitors C39 and C38 are respectively connected with the 5 and 8 pins of the integrated amplifying chip TDA2822M, the cathodes of the filter capacitors C34 and C37 are grounded, the anodes of the filter capacitors C34 and C37 are respectively connected with the 1 and 3 pins of the integrated amplifying chip TDA2822M, the cathodes of the filter capacitors C36 and C40 are respectively connected with the output ends of UoL and UoR, the filter capacitors C36 and C40 are respectively connected with R91 and R92 in series, the other ends of the R91 and R92 are grounded to filter high-frequency signals to form an output circuit;
the pulse signal generator module consists of a time base chip NE555, a 1KHz frequency selection circuit, a 1Hz frequency selection circuit and a frequency output circuit, wherein the 1KHz frequency selection circuit is used for completing the pulse frequency generation function of 1KHz and 1Hz, R109 is connected with a power supply +5V at one end, the other end is connected with the 7 pin of the time base chip NE555 and the positive electrode of R108 and D15 and is connected with C50 to ground, the 1KHz frequency selection circuit is formed by connecting the R109 and one end with the power supply +5V, and the other end is connected with the 7 pin of the time base chip NE555 and the positive electrode of R108 and D15 and the other end is connected with K, C to ground and is formed into a 2Hz frequency selection circuit, so that an output signal is 2Hz;
the digital electronic circuit module consists of a power supply part, a display circuit, an integrated block expansion part, a logic level display module circuit, a single pulse circuit and a logic comment input circuit, wherein the top is the power supply part, a flag-down mode display circuit, the lower part is the integrated block expansion part, the left and right sides of the expansion part are standby expansion COM ends, the logic level display module circuit is arranged below the integrated block expansion part, the single pulse circuit is arranged below the integrated block expansion part, and the logic comment input circuit is arranged below the integrated block expansion part; the power supply part is composed of +12V, -12V, +5V and-5V, AC V to provide the required direct current and alternating current voltage for the positive plate.
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| CN110136547B (en) * | 2019-05-23 | 2021-03-26 | 电子科技大学 | Signal sampling teaching demonstration instrument based on time domain waveform |
| CN110728890A (en) * | 2019-11-22 | 2020-01-24 | 河南中烟工业有限责任公司 | Portable PLC integrated experimental device |
| CN111162765B (en) * | 2020-01-20 | 2023-09-22 | 山东建筑大学 | Cascaded voltage amplifying circuit of MOSFET (Metal-oxide-semiconductor field Effect transistor) and BJT (bipolar junction transistor) for experiments |
| CN111934621B (en) * | 2020-09-25 | 2020-12-22 | 成都信息工程大学 | Oscillator suitable for small load condition |
| CN112382178A (en) * | 2020-12-09 | 2021-02-19 | 河北工业大学 | Portable experiment circuit board |
| CN114999289B (en) * | 2022-06-21 | 2024-05-14 | 山东师范大学 | Die electricity experiment box with detachable expansion module |
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