555 various signal generator circuit diagrams
Source: InternetPublisher:奥特man123 Keywords: signal generator generator circuit circuit diagram Updated: 2020/04/09
This circuit is the timing and audio circuit part of a certain monitoring device model machine. Including 15-20 second periodic pulse wave, second signal and 800Hz audio circuit.
IC 1, R18, R19, and C12 form an astable multivibrator. The oscillation period is T=0.693 (R18+2R19) C12. As needed, R19 can be changed to change the period and duty cycle.
IC2 and R23, R24, C13 form a second clock oscillator; IC 3 is an 800Hz audio oscillator, and its control terminal pin 5 is controlled by the on or off state of VT1, which can emit a pitch-changing sound.
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