CN202332021U - Digital-analog multifunctional test board - Google Patents

Digital-analog multifunctional test board Download PDF

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Publication number
CN202332021U
CN202332021U CN2011204389491U CN201120438949U CN202332021U CN 202332021 U CN202332021 U CN 202332021U CN 2011204389491 U CN2011204389491 U CN 2011204389491U CN 201120438949 U CN201120438949 U CN 201120438949U CN 202332021 U CN202332021 U CN 202332021U
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CN
China
Prior art keywords
module
amplifier
pin
chip
resistance
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CN2011204389491U
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Chinese (zh)
Inventor
尚宇炜
贺帆
冷亚辉
吴欧扬
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浙江大学
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Priority to CN2011204389491U priority Critical patent/CN202332021U/en
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Publication of CN202332021U publication Critical patent/CN202332021U/en

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Abstract

The utility model discloses a digital-analog multifunctional test board. The digital-analog multifunctional test board comprises a control component interface, an I2C (Integrated Circuit) bus module, an LCD (Liquid Crystal Display) module, a digital tube model, DAC (Digital-to-Analog Conversion) modules, an LED (Light Emitting Diode) module, a static storage module, a matrix keyboard module, a crystal oscillator module, an ADC (Analog-to-Digital Conversion) module, a DAC module, a first filter module, a second filter module, a loudspeaker module, a sampling theorem module, a sound sensor module, a temperature sensor module, a power conversion module, a virtual oscilloscope module and the like, wherein the I2C bus module, the LCD module, the digital tube model, the DAC modules, the LED module, the static storage module, the matrix keyboard module and the crystal oscillator module are electrically connected with the control component interface, and the ADC module, the DAC module, the first filter module, the second filter module, the loudspeaker module, the sampling theorem module, the sound sensor module, the temperature sensor module, the power conversion module and the virtual oscilloscope module are respectively provided with an input port and an output port. The digital-analog multifunctional test board disclosed by the utility model is mainly used for various test operations and developments for engineering university students in an undergraduate stage, most of test items required by teachings are contained in the digital-analog multifunctional test board, the university students are supported to do relative and comprehensive test operations, the digital-analog multifunctional test board is simultaneously provided with a circuit detection module and the virtual oscilloscope module, and thus the operation on relative tests is convenient.

Description

The multi-functional brassboard of digital-to-analogue
Technical field
The utility model relates to a kind of experimental provision, and the student who relates in particular to a kind of simulation, digital signal overall treatment and application uses brassboard.
Background technology
Through investigation, student miscellaneous in the market is with brassboard, development board, and product quality is uneven, and various brassboards all are that single kernel control chip is welded in the brassboard, and required expense is higher; Such as the DE0 brassboard of altera corp, this plate is a core with fpga chip CycloneIII EP3C16F484, and strong functions comparatively such as integrated VGA interface.But for the beginner; Often only can use the sub-fraction module in the brassboard; And can't from a brassboard, single-chip microcomputer, PLD etc. extensively be learnt, use, be unfavorable for integrated learning and the raising of beginner for the experiment of electronic apparatus class; Secondly; Current development board, brassboard generally do not combine analog part well with numerical portion; The rarer cover signal synthesis disposal system that in development board, adds, this is disadvantageous for overall treatment and the application that the learner comprehensively grasps simulation, digital signal.And, owing to adopt the plug-in wiring to be prone to cause contact bad, increased supervision time and the workload of experimenter to connecting line for the brassboard module of analogous circuit experiment; At last, when the beginner need observe various signal waveform, often need an oscillograph, this makes that the investment of experimental facilities is bigger, and has limited the use occasion of brassboard, is unfavorable for that the user carries.
The utility model content
Can only carry out programming Control to a kind of specific control chip in order to overcome existing development board, brassboard, and the hardware circuit design of existing development board there not be special industry science student towards undergraduate stage; And do not detect connecting line to the brassboard of mimic channel and whether contact the good detection circuit; And need external oscillograph to make input, the experimental facilities of experimental facilities increase and be unfavorable for carrying, do not suit the shortcoming that conveniently experimentizes in non-dedicated experiments place for signal analysis class, the experiment of Digital Logic analysis classes; The utility model provides a kind of brassboard; Its circuit layout supports various types of control chips to control through cooperating expansion board; Each Module Design is learned the requirement of experiment of simulation, numeric class core curriculum needs specially to industry science class undergraduate; Simultaneously; Need carry out during for analogous circuit experiment providing when lead between the module connects and detect lead and whether connect normal testing circuit and supporting and have that virtual oscilloscope is convenient to be connected with computer, signal is observed, gain knowledge so that better grasp.
The technical scheme that technical matters adopted that the utility model solves is: the multi-functional brassboard of a kind of digital-to-analogue comprises matrix keyboard module, D/A converter module, analog-to-digital conversion module, charactron module, light-emitting diode (LED) module, I 2C bus module, crystal oscillator module and LCD display module; It is characterized in that: also be provided with loudspeaker module, sound transducer module, temperature sensor module, first filter module, second filter module, sampling theorem module, static store module, control device interface, power conversion module and virtual oscilloscope module on the multi-functional brassboard of digital-to-analogue; The control device interface comprises plurality of chips slot, I 2C bus module, LCD display module, charactron module, D/A converter module, light-emitting diode (LED) module, static store module, matrix keyboard module, D/A converter module and crystal oscillator module are electrically connected respectively with the segment chip slot of control device interface, and analog-to-digital conversion module, D/A converter module, first filter module, second filter module, loudspeaker module, sampling theorem module, sound transducer module, temperature sensor module, power conversion module and virtual oscilloscope module are respectively equipped with IO port.
The beneficial effect of the utility model is; Have and stronger can conveniently accomplish the comprehensive experiment of most simulations, numeric class and modulus to industry science class experiment undergraduate stage; Wiring between module and the module is set, makes the experimenter can make things convenient for the connection of freely carrying out between each module; The line pick-up unit is set is user-friendly for the inspection of line, and the input that provides virtual oscilloscope to reduce experimental facilities, and the volume of control brassboard is convenient for carrying.
Description of drawings
With reference to below in conjunction with the explanation of accompanying drawing, can understand the above of the utility model and other purpose, characteristics and advantage to the utility model embodiment with being more prone to.Parts in the accompanying drawing are just in order to illustrate the principle of the utility model.
Fig. 1 is the structure principle chart of the utility model.
Fig. 2 is the control device interface.
Fig. 3 is a light-emitting diode (LED) module.
Fig. 4 is the charactron module.
Fig. 5 is I 2The C bus communication module.
Fig. 6 is a D/A converter module.
Fig. 7 is an analog-to-digital conversion module.
Fig. 8 is a temperature sensor module.
Fig. 9 is the sound transducer module.
Figure 10 is the static store module.
Figure 11 is the sampling theorem module.
Figure 12 is the supporting low pass filter blocks of sampling theorem module.
Figure 13 is the matrix keyboard module.
Figure 14 is an analog filter block.
Figure 15 is the power conversion module.
Figure 16 is the crystal oscillator module.
Figure 17 is the wiring detection module.
Figure 18 has the filter module that wiring detects.
Figure 19 is a loudspeaker module.
Figure 20 is the LCD display module.
Embodiment
The embodiment of the utility model is described with reference to the accompanying drawings.Element and the characteristic in the accompanying drawing of the utility model or a kind of embodiment, described can combine with element and the characteristic shown in one or more other accompanying drawing or the embodiment.Should be noted that for purpose clearly, omitted and the utility model parts irrelevant, that those of ordinary skills are known and the expression and the description of processing in accompanying drawing and the explanation.
Fig. 1 is the structure principle chart of the multi-functional brassboard of the utility model digital-to-analogue, and said brassboard is provided with LCD display module, matrix keyboard module, D/A converter module, analog-to-digital conversion module, charactron module, crystal oscillator module, loudspeaker module, sound transducer module, temperature sensor module, filter module, sampling theorem module, light-emitting diode (LED) module, I 2C bus module, static store module, control device interface, power conversion module, wiring detection module, virtual oscilloscope module.Wherein the part pin of control device interface in advance with I 2C bus module, LCD display module, charactron module, D/A converter module, light-emitting diode (LED) module, static store module, crystal oscillator module, matrix keyboard module, D/A converter module link to each other, and in Fig. 1, represent with solid line; The module that does not directly link to each other with the control device interface (among Fig. 1 i.e. first filter module 1, second filter module 2) provides the input and output interface; D/A converter module provides output pin; Analog-to-digital conversion module provides input pin; Can supply the user freely to connect, with dashed lines has provided a kind of embodiment of connected mode in Fig. 1, and the user also can carry out alternate manner as required and connect.
Shown in Figure 2 is the preferred embodiment of control device interface, realizes that through two vertical setting of types slots the various control devices that are used to peg graft (for example control chip) carry out various experiments with each module on control the utility model digital-to-analogue multifunction test plate.Consider that different types of control device pin is distributed with very big difference; In order to save the space of circuit board as far as possible; And guarantee to use the various control device; This brassboard leaves two vertical setting of types totally 84 chip pocket; It is identical with AT89C51 single-chip microcomputer dual-in-line package chip width that said chip pocket width is designed to, so that the control chip of dual-in-line package (being generally dual inline type 40 pin package like 80C51 single-chip microcomputer series A T89C51, STC89C52, STC89C55RD etc.) can directly insert said chip pocket.The circuit of the utility model brassboard is with the segment chip slot and the I of control device interface 2The corresponding pins of module such as C bus module, LCD display module, LED charactron module, D/A converter module, light-emitting diode (LED) module, static store module, crystal oscillator module, matrix keyboard module, D/A converter module are connected.When said control chip adopted AT89C51 to be used for doing experiment, directly the respective chip slot with this AT89C51 control chip slave controller spare interface inserted (for example No. 1 pin of No. 1 slot corresponding A T89C51 single-chip microcomputer among Fig. 1), can directly carry out experiment; When the control chip of selecting other non-dual-in-line package for use is done experiment; User (like the student) should be equipped with switching circuit board voluntarily; The line design of this switching circuit board; Should make each pin of selected control chip through behind switching circuit board, link to each other with the slot (pin) that corresponding function is arranged on the said chip pocket.For example, the crystal oscillator input pin of selected control chip is through after the switching circuit board switching, should with the control device interface in advance with the utility model brassboard on two slots (pin) of crystal oscillator module connection be connected; The 5V power supply of selected control chip power supply input pin should through switching circuit board and control device interface prior with the utility model brassboard on the slot (pin) of 5V power supply UNICOM of power conversion module be connected, just can carry out concrete experimental project then.Simultaneously, the design of control device interface makes to also have redundancy in these 84 chip pocket in basis by its used various control chips of undergraduate education experiment of can pegging graft, and makes the control device interface according to user's needs, and expansion connects other control chip.
In order to narrate conveniently, hereinafter, used control chip is defaulted as the AT89C51 single-chip microcomputer, and abbreviates the AT89C51 single-chip microcomputer as single-chip microcomputer; When the slot (pin) of each module on the brassboard and control device interface when being connected, the slot title is the title of the control chip pin that is electrically connected with it.
Shown in Figure 3 is the light-emitting diode (LED) module in this product; Light emitting diode adopts complete eight light emitting diodes in the present embodiment, and adopts common anode to connect method, and+5V power supply inserts on eight exclusions; Each exclusion is drawn single line; Be connected respectively on the light emitting diode, the P00 that these eight light emitting diode opposite sides are connected respectively to single-chip microcomputer is to the P07 pin, and the experimenter just can pass through Single-chip Controlling; Accomplish the running lamp related experiment, show or the like like style running lamp, stop-light, displacement.Led color is designed to red, yellow, green three kinds, with the color of simulation traffic lights, convenient show and observe.
Shown in Figure 4 is the charactron module, and in the present embodiment, charactron adopts eight digit number sign indicating number pipe, and this eight digit number sign indicating number pipe is made up of two 4 charactron DS1 and DS2.This module takes to take turns apparent mode, and with the code translator of chip 74HC573 as charactron, chip 74HC138 realizes that wheel shows conversion.Wherein, Single-chip microcomputer pin P10 is connected to the 1D-8D pin on the chip 74HC573 successively to P17; Signal input end; The output terminal 1Q-8Q of chip 74HC573 links to each other with 11,7,4,2,1,10,5,3 pins of charactron DS1 and DS2 respectively successively, and the number after the decoding is shown.The P20 of single-chip microcomputer shows control to A, B, the C pin that P22 is connected on the chip 74HC138 successively as wheel; The output terminal pin Y0-Y7 of 74HC138 chip is connected on 12,9,8,6 pins of 12,9,8,6 and DS2 of charactron DS1 successively, controls its demonstration.Utilize Single-chip Controlling light-emitting diode (LED) module and charactron module can do experiment as: traffic lights timing, counter, stopwatch, smart electronics clock, charactron dynamically show, static show or the like.
Shown in Figure 5 is I 2The C bus communication module mainly utilizes chip AT24C02, and the A0 of chip, A1, A2 and WP hold equal ground connection, and SCK and SDA pin are connected to single-chip microcomputer P23 and P24 pin successively as control.Utilize this module of Single-chip Controlling can accomplish I 2The experiment of C communications protocol.
Shown in Figure 6 is D/A converter module.Chip DAC0800 is adopted in digital-to-analog conversion.The input end B1-B8 of DAC0800 chip is connected to the P30-P37 pin of single-chip microcomputer successively.REF (-) pin of DAC0800 chip is resistance eutral grounding through 5K Europe, and resistance connects+5V REF (+) pin through 5K Europe, and the Vcc pin connects+5V; This pin is through 0.1 μ F capacity earth simultaneously, and the V-pin is received the COMP pin through one 0.01 μ F electric capacity simultaneously through one 0.01 μ F capacity earths; Vee pin ground connection; The Iout pin is linked the end of oppisite phase of operational amplifier LM741, links the output terminal of operational amplifier LM741 simultaneously through a 5K Europe resistance, and the in-phase end of operational amplifier LM741 is resistance eutral grounding through 5K Europe; The amplifier output terminal is connected on the contact pin, supplies the experimenter to use voluntarily.
Shown in Figure 7 is analog-to-digital conversion module.Analog to digital conversion adopts chip ADC0809.The Vcc pin of chip ADC0809 and REF (+) pin connect+5V, and REF (-) pin and ADDA, ADDB, ADDC pin and GND pin ground connection, INO connects two branch roads outward as input pin.Article one, branch road connects the 5K resistance eutral grounding, and another branch road is received contact pin behind 5K resistance, as input end.Be provided with contact pin on all the other pin next doors of chip, the user can be communicated with pin as required with single-chip microcomputer.Utilize Single-chip Controlling Fig. 5 and module shown in Figure 6, can carry out conversion and the processing between simulating signal and the digital signal easily.Through analog-to-digital conversion module, can accomplish conversion, and utilize single-chip microcomputer that it is carried out digitized processing (will accomplish a complete signal sampling and also need use wave filter with output experiment and carry out filtering, filter module is described below) analog quantity.Through the Single-chip Controlling D/A converter module, can abstract digital quantity be become the analog quantity of easy observation and acceptance.The experiment that utilizes said D/A converter module and analog-to-digital conversion module to realize has: waveform generator, electronic multimeter, this multimeter can be measured a plurality of circuit informations such as effective value, peak value, frequency.
Shown in Figure 8 is temperature sensor module.In the present embodiment, temperature sensor module adopts the DS18B20 chip, and No. 1 pin of DS18B20 chip connects+the 5V power supply, and resistance R ES is connected to No. 2 pins of DS18B20, No. 3 pin ground connection of DS18B20 through 10k Europe simultaneously.No. 2 pins of DS18B20 are connected to single-chip microcomputer P27 pin simultaneously as input.
Shown in Figure 9 is the sound transducer module.The Electret condenser microphone minus earth, positive pole connects+the 12V power Vcc through 47K potentiometer R14 and 5K resistance R 13, draws a branch road between 47K potentiometer R14 and the 5K resistance R 13 in addition through 47 μ F capacitor C, 5 ground connection.Simultaneously, it is anodal that the Electret condenser microphone positive pole meets 4.7 μ F electrochemical capacitor C9, and electrochemical capacitor C9 negative pole connects amplifier NE5532 (1) end of oppisite phase through 1k resistance R 16, and 16 of electrochemical capacitor C9 and resistance R are drawn branch road through the 4.7k resistance eutral grounding.Amplifier NE5532 (1) end of oppisite phase is connected to amplifier NE5532 (1) output terminal through 4.7K resistance R 18.Amplifier NE5532 (1) in-phase end is through 1k resistance R 17 ground connection.Amplifier NE5532 (1) output terminal connects the D pin of IRFD120 through 10k resistance R 19, draws signal wire B from this pin simultaneously.The G pin of IRFD120 passes through the 1M resistance R 20 of parallel connection and the electrochemical capacitor C10 ground connection of 1 μ F, and draws signal wire A simultaneously.The S pin ground connection of IRFD120.Signal wire A inserts the collector C of PNP triode Q1 via 2.2k resistance R 22.The emitter E of triode Q1 connects+5V, meets the base stage B of triode Q1 simultaneously through 10k resistance R 21, and the base stage B of triode Q1 connects the output terminal of amplifier NE5532 via the capacitor C 11 of 0.1 μ F.Signal wire B connects the in-phase end of amplifier NE5532 (2).The end of oppisite phase of amplifier NE5532 (2) connects the amplifier output terminal through 47k resistance R 24 simultaneously through 470 Europe resistance R, 23 ground connection.The output terminal of amplifier NE5532 (2) connects the end of oppisite phase that amplifier LM741 is inserted in 5k resistance R 25 backs via the capacitor C 12 of 0.1 μ F, and the end of oppisite phase of amplifier LM741 connects the output terminal of amplifier LM741 through potentiometer R27.The in-phase end of amplifier LM741 is through 5k resistance R 26 ground connection.Amplifier LM741 output termination pin J4.This module is used for the voice signal of Electret condenser microphone collection is amplified automatically, so that subsequent module is to the processing of voice signal.
Figure 10 is the static store module.Constitute by a slice HM628128D chip.The Vcc pin of HM628128D chip connects+5V voltage, and the CS2 pin connects+5V voltage.Vss, CS1 pin ground connection.HM628128D chip pin ADR0-ADR16 links to each other with the 41-58 pin of control device interface successively; HM628128D chip pin YY0-YY7 links to each other with the 59-67 pin of control device interface successively (will use the HM628128D chip; The pin of used control chip should be able to link to each other with above-mentioned pin after through switching circuit board could realize the control to the HM628128D chip; Therefore, if control chip is AT89C51, then must weld switching circuit board of system again).
Shown in Figure 11 is the sampling theorem module.Like figure; Square-wave pulse signal (can provide through function signal generator or control chip programming) is from No. 10 pin inputs of chip BU4053; Signal to be sampled is through the Y0 pin input of chip BU4053; In the inner sampling process of accomplishing of chip BU4053, can the signal that sampling is accomplished be exported through the Y pin at last.The Y1 of chip BU4053, INH, Vss pin ground connection, the Vee pin connects-5V, and the Vcc pin connects+5V.
Figure 12 is the supporting low pass filter blocks of sampling theorem module.Consisting of of low-pass filter: import by contact pin Js-8; After 2.2K resistance R 34; One the tunnel links the amplifier output terminal through 0.1 μ F capacitor C 26, and one the tunnel links the amplifier in-phase end through 2.2K resistance R 35, and amplifier end of oppisite phase one tunnel is ground connection after 10K resistance R 36; One the tunnel is connected to the amplifier output terminal through 10K resistance R 37, and last output terminal is connected on the contact pin J6.The indirect 0.1 μ F capacitor C 27 of amplifier in-phase end and ground wire.Through being connected of two modules of Figure 10 and Figure 11, can accomplish the whole process that echo signal is sampled and reduced, can verify sampling theorem.And this filter cutoff frequency can be regulated through potentiometer R35-1.
Figure 13 is matrix keyboard module, i.e. matrix keyboard.Two pins about each button of matrix keyboard has; Single-chip microcomputer P30 pin connects the right-hand member of button S1, S2; Single-chip microcomputer P31 pin connects the right-hand member of button S3, S4, and single-chip microcomputer P32 pin connects the left end of button S2, S4, and single-chip microcomputer P33 pin connects the left end of button S1, S3.Form matrix keyboard with this, can make things convenient for human-computer interaction, increase controllability.Can realize such as experiment contents such as keyboard scan, pushbutton switches.In other embodiments, matrix keyboard also can be by 8 buttons.
Figure 14 is an analog filter block.Two identical filter modules have been provided among this figure, i.e. first filter module 1 and second filter module 2.Be example with first filter module 1 when connected mode is described.This wave filter is divided into two-stage, and the end of oppisite phase of the amplifier LM741 of the first order is linked output terminal through 10K resistance simultaneously through the 10K resistance eutral grounding.The in-phase end of amplifier is received a contact pin J10 as input end through two 0.01 μ F capacitor C 29, C28 successively, and 29 of capacitor C 28 and capacitor C connect the amplifier output terminal through 120K resistance R 38.The amplifier in-phase end is through 120K resistance R 39 ground connection.The amplifier output terminal is received next stage behind 27K potentiometer R42.Pin links to each other with another pin after 1000pF electric capacity is received second level amplifier output terminal in the middle of the R42, receives the in-phase end of second level amplifier simultaneously through 74K resistance, and end of oppisite phase is linked output terminal through 10K resistance R 45 simultaneously through 10K resistance R 44 ground connection.This low pass filter cutoff frequency can be regulated through R42.Experimenter's this module capable of using is done filtering experiment or is cooperated the prime filtering of carrying out simulating signal with digital-to-analogue revolving die piece and analog-to-digital conversion module and smothing filtering that digital-to-analog conversion is exported.
Figure 15 is the power conversion module, is made up of LM7805, LM7905, electric capacity, diode.At first by positive and negative 12V power supply as original input; Be connected to 1 pin and 2 pin of LM7805, LM7905 respectively; 2 pin of LM7805 and 1 pin of LM7905 interconnects and altogether; Ground wire is through diode and 0.1 μ F electric capacity and be connected to 3 pin of LM7805, simultaneously through diode and 1 μ F electric capacity and be connected to 3 pin of LM7905.3 pin of LM7805, LM7905 are exportable positive and negative 5V voltage.
Figure 16 is the required crystal oscillator (crystal oscillator module) of control chip (like single-chip microcomputer or PLD), and the unification of the utility model brassboard provides the 24M crystal oscillator to use as the benchmark crystal oscillator, and is as shown in the figure.Crystal oscillator Y1 both sides are respectively through the 30pF capacity earth, and the crystal oscillator both sides are connected to the XTAL1 and the XTAL2 of single-chip microcomputer again simultaneously, and clock signal is provided.
The multi-functional brassboard of the digital-to-analogue of the utility model also comprises two wiring detection modules; This two wiring detection module links to each other with the input of first wave filter 1 and second wave filter 2 respectively, and whether being used to detect needs, to insert the connection of lead of input end of the multi-functional brassboard of said digital-to-analogue normal; Figure 17 is this brassboard wiring detection module, and each wiring detection module comprises sampling resistor (Rs4), amplifier (A1), patches pin (J2), contact pin (J3), contact pin (J4), electric capacity (C7), resistance (R2), resistance (R3), resistance (R4), light emitting diode (D1) and light emitting diode (D2).Consider and used more analog module on this brassboard, need connect with Du Pont's line between the module.And jack very easily causes loose contact on lead and the brassboard.Therefore this brassboard utilizes circuit unit shown in Figure 17; Need carry out the place that circuit connects to the experimenter and whether contact well with jack, can realize whether non-direct current signal lead contacted with jack and well carry out the online in real time detection through LED prompting this place's lead.This module comprises two NE5532 amplifier A1, A2.The lead that needs are pegged graft inserts the input end on the utility model brassboard, and input end patches pin J4 through the in-phase end that sampling resistor Rs4 inserts amplifier A1 between amplifier A1 and resistance R s4 in addition.Signal input part directly patches pin J2, amplifier A1 anti-phase termination pin J3.The output terminal of amplifier A1 links to each other with the in-phase end of amplifier A2 through capacitor C 7.Capacitor C 7 and amplifier A2 in-phase end between draw branch road through resistance R 2 ground connection.The output terminal of amplifier A2 is ground connection after the resistance R 3, R4 of series connection, draws the end of oppisite phase that branch road meets amplifier A2 between R3, the R4.The output terminal of amplifier A2 is anode and the negative electrode of D1, the negative electrode of D2 and the equal ground connection of the anode of D1 of sending and receiving optical diode D2 in addition.This module links to each other with the aforesaid filters module in the utility model brassboard; It is the input end of filter module that the in-phase end of the amplifier A1 of this detection module inserts tested module; During actual the use, the filter module input signal is by the connection jaws J1 input of this module.Cite an actual example below and introduce method of application: when normally detecting; J3 is linked to each other with short circuit cap with J2 wiring place, J3 and J4 are broken off, J1 inserts the input signal of tested module; Then can on resistance R s4, produce voltage; This voltage is delivered to the LED two ends after amplification filtering, LED can light, the cue circuit on; When not detecting, only need J3 be linked to each other with short circuit cap with J4, J3 and J2 break off, and then LED can not light.If detect the experimental circuit operate as normal, LED can light the prompting user should locate the lead contact well; If all do not work the expression lead contact with jack undesired, thereby avoided the user owing to circuit question and the trouble of again and again checking.In the filter module of this brassboard, all added this module testing circuit.
Figure 18 is the filter module that has the wiring detection module.This module is the actual connection layout of above-mentioned said low pass filter blocks and wiring detection module.Concerning industry insider, other that be prone to know that this wiring detection module can be applicable to this brassboard equally contains in the module of input interface.
Figure 19 is a loudspeaker module.The input contact pin J3 warp 100 Europe resistance R 28 of this module connect the end of oppisite phase of amplifier OP07, and the amplifier end of oppisite phase is connected to the amplifier output terminal through potentiometer R30.The amplifier in-phase end is through 100 Europe resistance R, 29 ground connection.The amplifier output terminal is through potentiometer R31 ground connection, and the intermediate head of potentiometer R31 warp 3 μ F electrochemical capacitor C13 connect the in-phase end of amplifier LM386, the end of oppisite phase ground connection of LM386, and the Vcc pin of LM386 is through 1 μ F electrochemical capacitor ground connection, and the Vcc pin connects+the 12V power Vcc simultaneously.No. 1 pin of LM386 meets potentiometer R32 through the electrochemical capacitor C15 of 10 μ F, and the potentiometer centre tap links to each other with the other end and is connected to No. 8 pins of LM386.No. 7 pins of LM386 are through 220 μ F electrochemical capacitor ground connection.The output terminal of LM386 inserts loudspeaker one end, the other end ground connection of loudspeaker through the electrochemical capacitor C18 of 220 μ F.Draw branch road ground connection after the 0.047 μ F capacitor C 17 of connecting and 10 Europe resistance R 33 between the output terminal of LM386 and the electrochemical capacitor C18.
Figure 20 is the LCD display module.Among the figure 1602 is slot.Single-chip microcomputer RD pin connects No. 1 pin of 74LS00 chip UA, and single-chip microcomputer WR pin connects No. 2 pins of 74LS00 chip UA.No. 3 pins of 74LS00 chip UA connect No. 4 pins of 74LS00 chip UB, and the Q4 pin of 74LS373 chip connects No. 5 pins of 74LS00 chip UB.No. 6 pins of 74LS00 chip UB connect No. 9 pins and No. 10 pins of 74LS00 chip UC, and No. 8 pins of 74LS00 chip UC connect the E pin of 1602 slots.Single-chip microcomputer P10-P17 pin connects the D7-D0 pin of 74LS373 chip successively.The OE pin ground connection of 74LS373 chip, the ALE pin of single-chip microcomputer connects the LE pin of 74LS373.The Q7-Q0 pin of 74LS373 connects the DB0-DB7 pin of 1602 slots successively.The GND pin of 1602 slots and BGGND pin ground connection, VCC pin and BGVCC pin connect+5V power supply VCC.The potentiometer in a 5k Europe of cross-over connection between power supply VCC and ground wire GND, the centre tap of potentiometer connects the VO pin of 1602 slots.During use, only need 1602 modules are inserted slot by prescribed direction, can control through single-chip microcomputer.
The user observes experimental result for ease, saves the input of experimental facilities simultaneously, saves the volume of brassboard, and this brassboard adds the virtual oscilloscope module.Concrete realization can be adopted virtual oscilloscope module on sale on the market, and wherein a kind of implementation is to use the DSO2090USB virtual oscilloscope module of Di Yang company.Can realize demonstration, analysis and the calculating of waveform through the software kit that uses USB and the said firm.The point that only needs during use to measure inserts the USB line USB interface of computer again with the input end of probe AM access module, and the software kit that operation the said firm provides can realize that the fact of waveform observes and measurement.When tested voltage is to use the probe of not being with decay at 0~5V, when tested voltage during, use the probe of band decay greater than 5V, attenuation multiple is confirmed according to tested voltage.
The utility model brassboard intermodule in design all provides input/output terminal, and the experimenter can freely connect through Du Pont's line, can accomplish the experiment content of numerous complicated.Wherein most characteristic is voice collecting, storage, processing and playback system.Its concrete mode of connection is: the output terminal contact pin of sound transducer module is linked to each other with Du Pont's line with the input end contact pin of analog filter block; The contact pin that connects analog filter block output terminal and analog-to-digital conversion module input end again; 8 inputs of analog-to-digital conversion module are connected to the I/O pin of single-chip microcomputer respectively, just can voice signal be gathered from the external world, and carry out preliminary filtering clutter through analog filter; Finally, send in the middle of the single-chip microcomputer by analog to digital conversion; After this, in the middle of single-chip microcomputer, can carry out digital processing, and can cooperate through matrix keyboard module and LED light-emitting diode module, so that human-computer interaction, control static store module is stored; If think that audio playback comes out the most at last; Then need be with an I/O pin in the single-chip microcomputer as output terminal; Link to each other with the analog-to-digital conversion module input end with Du Pont's line; Again the analog-to-digital conversion module output terminal is linked to each other with the analog filter block input end, at last the analog filter block input end is connected with the loudspeaker module output terminal, just can hear the voice signal after the processing.Can further handle sound through single-chip microcomputer, also adjustable filter module slide rheostat resistance is listened sound is carried out filtered effect, and then better understands signals collecting and the effect of handling each module
The utility model includes power interface, control device interface; Matrix keyboard, light-emitting diode (LED) module, charactron module, analog-to-digital conversion module, D/A converter module, static RAM module; Sound transducer module, loudspeaker, temperature sensor, and I 2C EBI, LCD display module, signal processing comprise active low pass filter blocks, active band-pass filter module, power amplifier module, and wiring detection module, virtual oscilloscope module.The utility model is combining through simulation system and digital display circuit in use; Experiment, the study that can realize simulating, numeral, digital-to-analogue combines and develop integrated application; And the situation of change that can observe line signal through virtual oscilloscope intuitively, have rational in infrastructure, use and advantage easy to carry, with strong points.

Claims (9)

1. the multi-functional brassboard of digital-to-analogue comprises matrix keyboard module, D/A converter module, analog-to-digital conversion module, charactron module, light-emitting diode (LED) module, I 2C bus module, crystal oscillator module and LCD display module; It is characterized in that: also be provided with loudspeaker module, sound transducer module, temperature sensor module, first filter module, second filter module, sampling theorem module, static store module, control device interface, power conversion module and virtual oscilloscope module on the multi-functional brassboard of said digital-to-analogue; Said control device interface comprises the plurality of chips slot, said I 2C bus module, LCD display module, charactron module, D/A converter module, light-emitting diode (LED) module, static store module, matrix keyboard module, D/A converter module and crystal oscillator module are electrically connected respectively with the segment chip slot of said control device interface, and said analog-to-digital conversion module, D/A converter module, first filter module, second filter module, loudspeaker module, sampling theorem module, sound transducer module, temperature sensor module, power conversion module and virtual oscilloscope module are respectively equipped with IO port.
2. the multi-functional brassboard of digital-to-analogue according to claim 1; It is characterized in that it is two vertical setting of types chip pocket of 84 jacks that said control device interface is provided with; It is identical with dual-in-line package chip width that said chip pocket width is designed to, and makes the chip of said dual-in-line package can directly insert said chip pocket.
3. the multi-functional brassboard of digital-to-analogue according to claim 1; It is characterized in that the multi-functional brassboard of said digital-to-analogue also comprises two wiring detection modules; Said two wiring detection modules link to each other with the input of said first and second filter module respectively, and whether being used to detect needs, to insert the connection of lead of input end of the multi-functional brassboard of said digital-to-analogue normal; Each wiring detection module comprises sampling resistor (Rs4), amplifier (A1), patches pin (J2), contact pin (J3), contact pin (J4), electric capacity (C7), resistance (R2), resistance (R3), resistance (R4), light emitting diode (D1) and light emitting diode (D2); The input end of each wiring detection module inserts the in-phase end of amplifier (A1) through sampling resistor (Rs4); Amplifier (A1) and the indirect contact pin (J4) of resistance (Rs4); Said input end directly patches pin (J2); Amplifier (A1) anti-phase termination pin (J3); The output terminal of amplifier (A1) links to each other with the in-phase end of amplifier (A2) through electric capacity (C7); Electric capacity (C7) and amplifier (A2) in-phase end between draw branch road through resistance (R2) ground connection, the output terminal of amplifier (A2) is ground connection behind the resistance (R3), resistance (R4) of series connection, draws the end of oppisite phase that branch road meets amplifier (A2) between resistance (R3), the resistance (R4); The anode of the output terminal sending and receiving optical diode (D2) of amplifier (A2) and the negative electrode of light emitting diode (D1), the equal ground connection of anode of the negative electrode of light emitting diode (D2) and light emitting diode (D1).
4. the multi-functional brassboard of digital-to-analogue according to claim 1 is characterized in that said virtual oscilloscope module adopts the DSO2090USB virtual oscilloscope of Di Yang company.
5. the multi-functional brassboard of digital-to-analogue according to claim 1; The concrete implementation that it is characterized in that said loudspeaker module is: the input contact pin (J3) of said loudspeaker module connects the end of oppisite phase of amplifier (OP07) through 100 Europe resistance (R28); The amplifier end of oppisite phase is connected to the amplifier output terminal through potentiometer (R30); Amplifier (OP07) in-phase end is through 100 Europe resistance (R29) ground connection; Amplifier (OP07) output terminal is through potentiometer (R31) ground connection, and the intermediate head of potentiometer (R31) warp 3 μ F electrochemical capacitors (C13) connect the in-phase end of amplifier (LM386), the end of oppisite phase ground connection of amplifier (LM386); The pin (Vcc) of amplifier (LM386) is through 1 μ F electrochemical capacitor ground connection; The pin (Vcc) of amplifier (LM386) connects+the 12V power supply simultaneously, and No. 1 pin of amplifier (LM386) connects potentiometer (R32) through the electrochemical capacitor (C15) of 10 μ F, and potentiometer (R32) centre tap links to each other with the other end and is connected to No. 8 pins of amplifier (LM386); No. 7 pins of amplifier (LM386) are through 220 μ F electrochemical capacitor ground connection; The output terminal of amplifier (LM386) inserts said loudspeaker one end through the electrochemical capacitor (C18) of 220 μ F, and the other end ground connection of said loudspeaker is drawn branch road ground connection behind the 0.047 μ F electric capacity (C17) of connecting and 10 Europe resistance (R33) between the output terminal of amplifier (LM386) and the electrochemical capacitor (C18).
6. the multi-functional brassboard of digital-to-analogue according to claim 1; The concrete implementation that it is characterized in that said sound transducer module is: the Electret condenser microphone minus earth; Said Electret condenser microphone positive pole connects+12V power supply (Vcc) through 47K potentiometer (R14) and 5K resistance (R13), draws a branch road between 47K potentiometer (R14) and the 5K resistance (R13) in addition through 47 μ F electric capacity (C5) ground connection; Said Electret condenser microphone positive pole connects 4.7 μ F electrochemical capacitor (C9) positive poles, and electrochemical capacitor (C9) negative pole connects a NE5532 amplifier end of oppisite phase through 1k resistance (R16), draws branch road through the 4.7k resistance eutral grounding between electrochemical capacitor (C9) and resistance (R16); The one NE5532 amplifier end of oppisite phase is connected to a NE5532 amplifier output terminal through 4.7K resistance (R18), and a NE5532 amplifier in-phase end is through 1k resistance (R17) ground connection; The one NE5532 amplifier output terminal connects the D pin of IRFD120 chip through 10k resistance (R19), and the D pin of IRFD120 chip is drawn signal wire (B); The G pin of IRFD120 chip is through the 1M resistance (R20) of parallel connection and electrochemical capacitor (C10) ground connection of 1 μ F, and the G pin of IRFD120 chip is drawn signal wire (A); The S pin ground connection of IRFD120 chip; Signal wire (A) inserts the collector (C) of PNP triode (Q1) via 2.2k resistance (R22); The emitter (E) of triode (Q1) connects+5V and connect the base stage (B) of triode (Q1) through 10k resistance (R21), and the base stage (B) of triode (Q1) connects the output terminal of the 2nd NE5532 amplifier via the electric capacity (C11) of 0.1 μ F; Signal wire (B) connects the in-phase end of the 2nd NE5532 amplifier; The end of oppisite phase of the 2nd NE5532 amplifier connects the output terminal of the 2nd NE5532 amplifier through 470 Europe resistance (R23) ground connection and through 47k resistance (R24); The output terminal of the 2nd NE5532 amplifier connects the end of oppisite phase that amplifier (LM741) is inserted in 5k resistance (R25) back via the electric capacity (C12) of 0.1 μ F, and the end of oppisite phase of amplifier (LM741) connects the output terminal of amplifier (LM741) through potentiometer (R27); The in-phase end of amplifier (LM741) is through 5k resistance (R26) ground connection; Amplifier (LM741) output termination pin (J4).
7. the multi-functional brassboard of digital-to-analogue according to claim 1; It is characterized in that said temperature sensor module adopts the DS18B20 chip; No. 1 pin of DS18B20 chip connects+the 5V power supply and through 10k Europe resistance R ES is connected to No. 2 pins of DS18B20 chip, No. 3 pin ground connection of DS18B20 chip; No. 2 pins of DS18B20 chip are as input end.
8. the multi-functional brassboard of digital-to-analogue according to claim 1; What it is characterized in that said power conversion module comprises LM7805 chip, LM7905 chip, electric capacity and diode; 1 pin and 2 pin of LM7805 chip connect the 12V power supply; 1 pin and 2 pin of LM7905 chip connect the 12V power supply; 2 pin of LM7805 chip and 1 pin of LM7905 chip interconnects and altogether, ground wire is through diode and 0.1 μ F electric capacity and be connected to 3 pin of LM7805 chip and through diode and 1 μ F electric capacity and be connected to 3 pin of LM7905 chip, 3 pin of LM7805 chip and 3 pin of LM7905 are exportable positive and negative 5V voltage.
9. the multi-functional brassboard of digital-to-analogue according to claim 1 is characterized in that said static store module is the HM628128D chip, and said sampling theorem module is the BU4053 chip.
CN2011204389491U 2011-11-08 2011-11-08 Digital-analog multifunctional test board CN202332021U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103310689A (en) * 2013-06-19 2013-09-18 苏州市职业大学 MSP430 development board system
CN103645432A (en) * 2013-09-25 2014-03-19 临安科泰通信科技有限公司 Signal reproduction type integrated circuit board failure detection device
CN104882053A (en) * 2015-06-12 2015-09-02 安徽师范大学 Multifunctional teaching apparatus
CN105259831A (en) * 2015-10-26 2016-01-20 中国人民解放军军械工程学院 Universal FPGA debugging device
CN106971656A (en) * 2017-05-09 2017-07-21 杭州职业技术学院 A kind of comprehensive training platform of open-type sensor technology application
CN107038941A (en) * 2017-06-16 2017-08-11 哈尔滨工业大学 A kind of portable electronic Platform of Experimental Teaching
CN108447364A (en) * 2018-05-22 2018-08-24 同济大学 A kind of portable multi-function time domain sampling theorem experimental provision

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103310689A (en) * 2013-06-19 2013-09-18 苏州市职业大学 MSP430 development board system
CN103645432A (en) * 2013-09-25 2014-03-19 临安科泰通信科技有限公司 Signal reproduction type integrated circuit board failure detection device
CN103645432B (en) * 2013-09-25 2016-03-23 临安科泰通信科技有限公司 Signal reproduction type surface-mounted integrated circuit failure detector
CN104882053A (en) * 2015-06-12 2015-09-02 安徽师范大学 Multifunctional teaching apparatus
CN104882053B (en) * 2015-06-12 2017-10-17 安徽师范大学 A kind of multifunction teaching instrument
CN105259831A (en) * 2015-10-26 2016-01-20 中国人民解放军军械工程学院 Universal FPGA debugging device
CN106971656A (en) * 2017-05-09 2017-07-21 杭州职业技术学院 A kind of comprehensive training platform of open-type sensor technology application
CN107038941A (en) * 2017-06-16 2017-08-11 哈尔滨工业大学 A kind of portable electronic Platform of Experimental Teaching
CN108447364A (en) * 2018-05-22 2018-08-24 同济大学 A kind of portable multi-function time domain sampling theorem experimental provision

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