CN205283504U - Audio signal produces circuit - Google Patents

Abstract

The utility model discloses an audio signal produces circuit, including potentiometre RP1, electric capacity C1, resistance R1, resistance R2, triode VT1, potentiometre RP2 and electric capacity C4, resistance R2 one end is connecting resistance R3 respectively, resistance R5, resistance R7 and power VCC, electric capacity C2 and triode VT1 base are connected respectively to the resistance R2 other end, the electric capacity C2 other end is connecting resistance R1 respectively, electric capacity C1, triode VT1 projecting pole and resistance R4, potentiometre RP1 one end is connected to the electric capacity C1 other end, potentiometre RP1 gleitbretter is connected respectively to the potentiometre RP1 other end, the resistance R1 other end, electric capacity C5 and resistance R10, potentiometre RP2 one end is connected to the resistance R10 other end, electric capacity C4 is connected respectively to the potentiometre RP2 other end, resistance R9, the resistance R6 and the resistance R4 other end. The utility model discloses audio signal produces circuit adopts triode cooperation resistor -Capacitor unit, and circuit structure is simple, and is with low costs, small, and application scope is wide.

Description

A kind of audio signal generating circuit

Technical field

This utility model relates to a kind of signal generating circuit, specifically a kind of audio signal generating circuit.

Background technology

Audio signal generating circuit is a kind of audio oscillator, it can produce frequency low frequency signal in the range of audibility, when regulating the frequency of oscillation of audio signal generator, the signal frequency of its output also can change therewith, if signal frequency changed sends into earphone, then can hearing the sound of tonal variations, audio signal generating circuit not only can the change of ocular demonstration acoustic tones, can also use as the low frequency signal generator of frequency-adjustable, use scope widely.

Existing a lot of audio signal generating circuit all adopts Single-chip Controlling to export, and circuit structure is complicated, relatively costly, and needs program writing to coordinate, and development difficulty is big.

Utility model content

The purpose of this utility model is in that to provide a kind of audio signal generating circuit, with the problem solving to propose in above-mentioned background technology.

For achieving the above object, this utility model provides following technical scheme:

A kind of audio signal generating circuit, including potentiometer RP1, electric capacity C1, resistance R1, resistance R2, audion VT1, potentiometer RP2 and electric capacity C4, described resistance R2 one end connects resistance R3 respectively, resistance R5, resistance R7 and power supply VCC, the resistance R2 other end connects electric capacity C2 and audion VT1 base stage respectively, and the electric capacity C2 other end connects resistance R1 respectively, electric capacity C1, audion VT1 emitter stage and resistance R4, the electric capacity C1 other end connects potentiometer RP1 one end, and the potentiometer RP1 other end connects potentiometer RP1 slide plate respectively, the resistance R1 other end, electric capacity C5 and resistance R10, the resistance R10 other end connects potentiometer RP2 one end, and the potentiometer RP2 other end connects electric capacity C4 respectively, resistance R9, resistance R6 and the resistance R4 other end, the described resistance R3 other end is connecting triode VT1 colelctor electrode and electric capacity C3 respectively, and the electric capacity C3 other end connects the resistance R5 other end respectively, the resistance R6 other end and audion VT2 base stage, audion VT2 colelctor electrode connects the resistance R7 other end and the electric capacity C5 other end respectively, and audion VT2 emitter stage connects resistance R8, and the resistance R8 other end connects the resistance R9 other end and the electric capacity C4 other end respectively.

As this utility model further scheme: described power supply VCC voltage is 9V.

Compared with prior art, the beneficial effects of the utility model are: this utility model audio signal generating circuit adopts audion to coordinate Resistor-Capacitor Unit, and circuit structure is simple, and cost is low, and volume is little, applied widely.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of audio signal generating circuit.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.

Referring to Fig. 1, in this utility model embodiment, a kind of audio signal generating circuit, including potentiometer RP1, electric capacity C1, resistance R1, resistance R2, audion VT1, potentiometer RP2 and electric capacity C4, described resistance R2 one end connects resistance R3 respectively, resistance R5, resistance R7 and power supply VCC, the resistance R2 other end connects electric capacity C2 and audion VT1 base stage respectively, and the electric capacity C2 other end connects resistance R1 respectively, electric capacity C1, audion VT1 emitter stage and resistance R4, the electric capacity C1 other end connects potentiometer RP1 one end, and the potentiometer RP1 other end connects potentiometer RP1 slide plate respectively, the resistance R1 other end, electric capacity C5 and resistance R10, the resistance R10 other end connects potentiometer RP2 one end, and the potentiometer RP2 other end connects electric capacity C4 respectively, resistance R9, resistance R6 and the resistance R4 other end, the described resistance R3 other end is connecting triode VT1 colelctor electrode and electric capacity C3 respectively, and the electric capacity C3 other end connects the resistance R5 other end respectively, the resistance R6 other end and audion VT2 base stage, audion VT2 colelctor electrode connects the resistance R7 other end and the electric capacity C5 other end respectively, and audion VT2 emitter stage connects resistance R8, and the resistance R8 other end connects the resistance R9 other end and the electric capacity C4 other end respectively, described power supply VCC voltage is 9V.

Operation principle of the present utility model is: refer to Fig. 1, switch on power after VCC, audion VT2 turns on, during conducting, electric current grows out of nothing, the electric current of change contains faint various frequency signals, it exports from VT2 colelctor electrode, RP1 is delivered to through C5, the RC connection in series-parallel frequency selection circuit that C1 is constituted, this circuit selects the signal (fo=1/2 �� * RP1*C1) that frequency is fo from various frequency signals, fo signal is delivered to VT1 and is amplified, VT2 amplification is delivered in output again, then feed back to again VT1 base stage to be amplified, so it is repeatedly performed, the fo signal amplitude of VT2 colelctor electrode output is increasing, the fo signal amplitude feeding back to VT1 base stage also constantly increases, VT1, the voltage amplification factor A of VT/2 is gradually reduced, when A drops to certain value, the fo signal amplitude of VT2 output no longer increases, the fo signal of amplitude stabilization is through R10, RP2 exports.

R1 is feedback resistance, the feedback that it is constituted is a negative feedback, its function is the gain that the amplitude according to signal reduces VT1 automatically, as more big in VT2 output signal, the negative feedback signal amplitude feeding back to VT1 through R1 is more big, and VT1 gain is more low, RP, 2 is amplitude adjusted potentiometer, it is possible to regulate the amplitude of output signal.

It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and when without departing substantially from spirit of the present utility model or basic feature, it is possible to realize this utility model in other specific forms. Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in this utility model. Any accompanying drawing labelling in claim should be considered as the claim that restriction is involved.

In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.

Claims (2)

1. an audio signal generating circuit, including potentiometer RP1, electric capacity C1, resistance R1, resistance R2, audion VT1, potentiometer RP2 and electric capacity C4, it is characterised in that described resistance R2 one end connects resistance R3 respectively, resistance R5, resistance R7 and power supply VCC, the resistance R2 other end connects electric capacity C2 and audion VT1 base stage respectively, and the electric capacity C2 other end connects resistance R1 respectively, electric capacity C1, audion VT1 emitter stage and resistance R4, the electric capacity C1 other end connects potentiometer RP1 one end, and the potentiometer RP1 other end connects potentiometer RP1 slide plate respectively, the resistance R1 other end, electric capacity C5 and resistance R10, the resistance R10 other end connects potentiometer RP2 one end, and the potentiometer RP2 other end connects electric capacity C4 respectively, resistance R9, resistance R6 and the resistance R4 other end, the described resistance R3 other end is connecting triode VT1 colelctor electrode and electric capacity C3 respectively, and the electric capacity C3 other end connects the resistance R5 other end respectively, the resistance R6 other end and audion VT2 base stage, audion VT2 colelctor electrode connects the resistance R7 other end and the electric capacity C5 other end respectively, and audion VT2 emitter stage connects resistance R8, and the resistance R8 other end connects the resistance R9 other end and the electric capacity C4 other end respectively.

2. audio signal generating circuit according to claim 1, it is characterised in that described power supply VCC voltage is 9V.