CN203812462U

CN203812462U - Experimental circuit of LC sine-wave oscillation

Info

Publication number: CN203812462U
Application number: CN201420205424.7U
Authority: CN
Inventors: 韦友春
Original assignee: Jiangxi University of Technology
Current assignee: Jiangxi University of Technology
Priority date: 2014-04-25
Filing date: 2014-04-25
Publication date: 2014-09-03
Anticipated expiration: 2024-04-25

Abstract

The utility model discloses an experimental circuit of LC sine-wave oscillation and relates to an oscillation circuit. A positive electrode of a milliammeter is connected with a power supply UCC end and a negative electrode of the milliammeter is connected with a contact E of a second switch. A contact F of the second switch is connected with the collector of a triode T. A contact A and a contact B1 of the second switch are both connected with a dotted terminal of a second inductor. A contact A1 and a contact B of the second switch are both connected with a non-dotted terminal of the second inductor. The emitter of the triode is connected with a contact G of a first switch. A contact C and a contact D of the first switch connect a second capacitor and a third capacitor to the first inductor respectively. One end of a third resistor is connected with the power supply UCC end while the other end of the third resistor is connected with a positive electrode of a diode. A negative electrode of the diode is connected with a ground end GND. The experimental circuit of the LC sine-wave oscillation is simple in structure and reasonable in design, has easily purchasable circuit components, is low in cost, small in size, low in power, stable in waveforms, convenient to debug and observe, reliable in operation and good in stability, and is not easy to damage.

Description

The experimental circuit of LC sine-wave oscillation

Technical field

The utility model relates to a kind of oscillatory circuit, be specifically related to the experimental circuit of LC sine-wave oscillation.

Background technology

Oscillatory circuit is widely used in various electronic equipments, oscillatory circuit can produce oscillating current, oscillating current is the electric current that a kind of size and Orientation all changes with the cycle, can only be produced by oscillatory circuit, oscillatory circuit divides by the waveform of signal, can be divided into sine-wave oscillator and nonsinusoidal oscillator, in sine-wave oscillator, mainly contain LC oscillatory circuit, quartz crystal oscillator circuit (as patent CN100414834C-crystal acceleration oscillation circuit) and RC oscillatory circuit (as patent CN1300940C-high accuracy RC oscillator with optional frequency) etc. are several, the most stable with the frequency of quartz oscillator in these several circuit, but some is too simple, be not suitable for making experimental circuit, and general RC circuit stability is poor, the circuit that performance is good is too complicated, is also not suitable for making experimental circuit, LC oscillatory circuit stability is moderate, wherein inductance of three-point and Colpitts oscillation circuit are more extensive in reality use, but common LC oscillatory circuit volume is large, and debugging is difficult, waveform is unstable, so design a kind of novel LC sine wave oscillation circuit or necessary.This experimental circuit adopts the inductance of three-point oscillatory circuit of modification, and stability is better, not fragile, is convenient to debugging, meets two conditions of starting of oscillation in can proof theory teaching.

Summary of the invention

For the deficiency existing in prior art, the utility model object is the experimental circuit that is to provide a kind of LC sine-wave oscillation, and circuit structure is simple, reasonable in design, the element of institute's built-up circuit is easily buying all, and cost is low, and volume is little, power is low, waveform stabilization, not fragile, be convenient to debugging observation, reliable operation, stability is better.

To achieve these goals, the utility model is to realize by the following technical solutions: the experimental circuit of LC sine-wave oscillation, comprises the first inductance, the second inductance, the first electric capacity-tetra-electric capacity, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, milliammeter, triode, diode, the first switch and second switch, the positive pole of milliammeter connects power supply UCC end, and the negative pole of milliammeter meets the contact E of second switch, and the contact F of second switch connects the collector of triode T, the contact A of second switch, contact B1 all connects the Same Name of Ends of the second inductance, the contact A 1 of second switch, contact B all connects the non-same polarity of the second inductance, and the emitter of triode meets the contact G of the first switch, the contact C of the first switch, contact D connects respectively the second electric capacity, the 3rd electric capacity to the first inductance, the first inductance also connects the 4th electric capacity, the non-same polarity earth terminal GND of the first inductance, the emitter of triode connects the 4th resistance and extremely holds GND, and the base stage of triode connects the first resistance to power supply UCC end, and the base stage of triode connects the second resistance and extremely holds GND, the second resistance is also connected to the first electric capacity, one termination power UCC end of the 3rd resistance, the positive pole of another terminating diode of the 3rd resistance, the minus earth end GND of diode.

As preferably, the first described resistance is in series by fixed value resistance and the potentiometer of 18K Ω.

As preferably, the first described switch is single-pole double-throw switch (SPDT), and second switch is double-point double-throw switch.

As preferably, described the first inductance, the second inductance all adopt inductance L TF2-3.

As preferably, described triode adopts triode 3DG6.

The beneficial effects of the utility model: circuit structure is simple, reasonable in design, the element of institute's built-up circuit is easily buying all, and cost is low, and volume is little, and power is low, and waveform stabilization is not fragile, is convenient to debugging observation, reliable operation, stability is better.

Brief description of the drawings

Describe the utility model in detail below in conjunction with the drawings and specific embodiments;

Fig. 1 is circuit diagram of the present utility model.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the utility model.

With reference to Fig. 1, this embodiment is by the following technical solutions: the experimental circuit of LC sine-wave oscillation, comprise the first inductance L 1, the second inductance L 2, the first capacitor C 1-the 4th capacitor C 4, the first resistance R B1, the second resistance R B2, the 3rd resistance R A, the 4th resistance R E, milliammeter mA, triode T, diode D, the first K switch 1 and second switch K2, the positive pole of milliammeter mA connects power supply UCC end, the negative pole of milliammeter mA meets the contact E of second switch K2, the contact F of second switch K2 connects the collector of triode T, the contact A of second switch K2, contact B1 all connects the Same Name of Ends of the second inductance L 2, the contact A 1 of second switch K2, contact B all connects the non-same polarity of the second inductance L 2, the emitter of triode T meets the contact G of the first K switch 1, the contact C of the first K switch 1, contact D connects respectively the second capacitor C 2, the 3rd capacitor C 3 to first inductance L 1, the first inductance L 1 also connects the 4th capacitor C 4, the non-same polarity earth terminal GND of the first inductance L 1, the emitter of triode T meets the 4th resistance R E and extremely holds GND, the base stage of triode T meets the first resistance R B1 and holds to power supply UCC, the base stage of triode T meets the second resistance R B2 and extremely holds GND, the second resistance R B2 is also connected to the first capacitor C 1, a termination power UCC end of the 3rd resistance R A, the positive pole of another terminating diode D of the 3rd resistance R A, the minus earth end GND of diode D.

It should be noted that the first described resistance R B1 is in series by fixed value resistance and the potentiometer RW of 18K Ω.

It should be noted that the first described K switch 1 is single-pole double-throw switch (SPDT), second switch K2 is double-point double-throw switch.

It should be noted that described the first inductance L 1, the second inductance L 2 all adopt inductance L TF2-3.

In addition, described triode T adopts triode 3DG6.

This embodiment just can be gone respectively amplitude and the phase place of control circuit with the first K switch 1 and second switch K2, thereby reaches the whether object of starting of oscillation of control circuit; Regulator potentiometer RW controls the quiescent point of triode T, thereby ensures circuit steady operation; The first inductance L 1, all available wireless local oscillator coils of the second inductance L 2, cost is low, reliable operation, circuit has increased power indicating circuit, power indicating circuit is made up of the 3rd resistance R A and diode D, after access power supply, diode D can be luminous, is convenient to user and directly finds out that whether circuit working is normal.

The oscillation frequency of oscillatory circuit is determined by the first inductance L 1 and the 4th capacitor C 4, after access power supply, the base voltage of triode T is determined by the first resistance R B1 and the second resistance R B2 dividing potential drop, can make the quiescent point of triode T make it in vibration magnifying state by regulator potentiometer RW, the first capacitor C 1 is high-frequency filter capacitor, high-frequency interferencing signal that can the filtering external world, the collector power supply of triode T is that power supply passes through milliammeter mA, second switch K2, add by the second inductance L 2 coils again, the positive feedback signal of circuit is respectively by switch second switch K2 from the collector of triode T in addition, the second inductance L 2, the first inductance L 1, the second capacitor C 2(the 3rd capacitor C 3), the first K switch 1 is got back to the emitter of triode T, wherein the second capacitor C 2(the 3rd capacitor C 3) be coupling capacitance, size has determined the intensity of feedback signal, the position that changes second switch K2 can change the direction of the second inductance L 2 Same Name of Ends, thereby change phase place, when second switch K2 selects contact A, A1 position, when the first inductance L 1 is selected contact C, circuit just can vibrate.This circuit can be made into pcb board, but requires the trend of back side Copper Foil consistent with the figure of positive printing, and welding electronic elements is in the side of Copper Foil, and ready-made experiment base plate is arranged on the shell of a transparent fixing experiment base plate.

This embodiment circuit structure is simple, reasonable in design, and the element of institute's built-up circuit is easily buying all, and cost is low, and volume is little, and power is low, and waveform stabilization is not fragile, is convenient to debugging observation, reliable operation, and stability is better.

Embodiment 1: allow the starting of oscillation of this circuit, first allow the first K switch 1 select contact C, second switch K2 selects contact A, contact A ' position, general+6V power supply UCC place in circuit again, it is 0.4-0.6mA that regulator potentiometer RW makes the collector current of triode T pipe, then measures the voltage between transistor base and emitter with multimeter, as is less than the starting of oscillation of 0.6V explanation circuit, at this moment can, with the waveform of oscilloscope measurement triode T emitter, should see the sine wave that has a hundreds of KHz.

Embodiment 2: if second switch K2 is switched to contact B, B ' position, contact in the time of vibration, at this time second switch K2 has changed electric current and had entered the direction of current of first inductance L 1 coil, the phase condition of circuit starting of oscillation is changed, and just not starting of oscillation of circuit, also can't see sine wave.

Embodiment 3: if the first K switch 1 is switched to contact D in the time of vibration, at this time in circuit, the capacity of the 3rd capacitor C 3 diminishes, and the signal intensity of feedback also diminishes, and sine wave is also can't see at this time also not starting of oscillation of circuit.

More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

The experimental circuit of 1.LC sine-wave oscillation, it is characterized in that, comprise the first inductance (L1), the second inductance (L2), the first electric capacity (C1)-the 4th electric capacity (C4), the first resistance (RB1), the second resistance (RB2), the 3rd resistance (RA), the 4th resistance (RE), milliammeter (mA), triode (T), diode (D), the first switch (K1) and second switch (K2), the positive pole of milliammeter (mA) connects power supply UCC end, the negative pole of milliammeter (mA) meets the contact E of second switch (K2), the contact F of second switch (K2) connects the collector of triode (T), the contact A of second switch (K2), contact B1 all connects the Same Name of Ends of the second inductance (L2), the contact A 1 of second switch (K2), contact B all connects the non-same polarity of the second inductance (L2), the emitter of triode (T) meets the contact G of the first switch (K1), the contact C of the first switch (K1), contact D connects respectively the second electric capacity (C2), the 3rd electric capacity (C3) is to the first inductance (L1), the first inductance (L1) also connects the 4th electric capacity (C4), the non-same polarity earth terminal GND of the first inductance (L1), the emitter of triode (T) connects the 4th resistance (RE) and extremely holds GND, the base stage of triode (T) connects the first resistance (RB1) and holds to power supply UCC, the base stage of triode (T) connects the second resistance (RB2) and extremely holds GND, the second resistance (RB2) is also connected to the first electric capacity (C1), one termination power UCC end of the 3rd resistance (RA), the positive pole of another terminating diode (D) of the 3rd resistance (RA), the minus earth end GND of diode (D).
2. the experimental circuit of LC sine-wave oscillation according to claim 1, is characterized in that, described the first resistance (RB1) is in series by fixed value resistance and the potentiometer (RW) of 18K Ω.
3. the experimental circuit of LC sine-wave oscillation according to claim 1, is characterized in that, described the first switch (K1) is single-pole double-throw switch (SPDT), and second switch (K2) is double-point double-throw switch.
4. the experimental circuit of LC sine-wave oscillation according to claim 1, is characterized in that, described the first inductance (L1), the second inductance (L2) all adopt inductance L TF2-3.
5. the experimental circuit of LC sine-wave oscillation according to claim 1, is characterized in that, described triode (T) adopts triode 3DG6.