555 tone-changing audio circuit

Published:2011/6/15 22:39:00 Author:TaoXi | Keyword: 555, tone-changing, audio | From:SeekIC

As the figure 14-29 shows, the circuit uses the two bipolar type 555s as the core, the astable multivibrator is composed of the IC1 and RP1, R1, C1, f1=1.44/(RP1+2R1)C1, the frequency of figure parameters is about 1Hz. The output of IC1 adds to the control port of IC2 through the R2 and C2 integral circuits to make the IC2 to become a controllable multivibrator, the speaker outputs the tone-changing audio with the frequency of dozens of Hertz and thousands of Hertz.



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