Published:2011/6/7 4:23:00 Author:nelly | Keyword: multi-analogue sound, generator | From:SeekIC
As shown in the figure 11-22, the circuit is composed of two 555 and some resistor capacitor components, the astable multivibrator connsists of IC1 and RP1, R1, C1, the oscillation frequency is about 5~10Hz, it can be changed by adjusting RP1. The frequency of oscillator which is made of IC2 and RP2, R2, C2 is between 1~10kHz, it can be changed by adjusting RP2, IC2 is a controlable voltage oscillator, its control terminal 5 foot is controlled by triangular wave voltage, this triangular wave is obtained from IC1 output and then integrated by R4, C3 integration circuit. IC2's oscillation frequency changes in relation to control voltage, it will send out all kinds of analogue sound, such as cricket noise and bird sound.
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