This cycle will continue as long as S1 remains pushed. By driving pin#7 low, the IC begins to drain the capacitor via R2. Pin 2 of the 555 oscillator/timer, IC1, is finally triggered. When S1 is temporarily pushed, C1 begins to charge via resistors R1 and R2. Correction: Make sure to connect the pin#4 of the IC 555 with the positive supply line. It simply works with two integrated circuits and very few parts. The circuit illustrated below generates sounds similar to a genuine buzzer.
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