Touching monolithic flasher - buzzer circuit diagram

In the circuit, N1, N2 constitute the RS flip-flop, and the trigger end is pin 8 and 13; N3, N4 form the controlled oscillator, only when N3`s pin 1 is high, the oscillator works. When the finger touching pad TP1 is bridging, N1 output`s pin turns to high level, the oscillator will oscillate, then the LED flashes, and the flash frequency is determined by..

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