Audio signal generator ----- Audio Signal Generator

Audio signal generator The production of another circuit is simple and stable and reliable. This circuit is a phase shift oscillator as shown in Figure 1. Figure 2 is a printed board wiring diagram. In the circuit, the signal phase difference between the base of the triode V is 180 in the base and the gathering of the gathering, and the phase 180 is transformed by the three-pole RC phase-phase circuit (consisting of resistance R1-R3 and capacitance C1 to C3 "." The total phase difference of the circuit is 360 ", so the feedback of the circuit is the same phase, which satisfies the phase condition of the oscillation circuit. The amplitude condition required for the oscillation circuit requires only the β value of V. 1882.50 to satisfy. The circuit is connected At the V-collector loop string into the DC current gear of the multimeter, the normal current value should be about 2 mA. If the current deviation is large, the resistance of the bias resistor R4 of V can be appropriately changed. Make the current normally. Turn on the power switch S. The circuit produces self-excited oscillation, and a 1 kHz audio signal can be obtained at the output. V is also used interchangeably in voices in the circuit. Author: 肇 全

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