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Touching monolithic flasher - buzzer circuit diagram

2017-02-05 16:59  
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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 10 turns to high level, the oscillator will oscillate, then the LED flashes, and the flash frequency is determined by the VR1 and C3. Changing the value of VR1 and C3, we can change the LED flashing frequency. When the finger is bridged to TP2, N1 output is low, the oscillator will stop working. If needs the external buzzer, then you can connect it to N4's pin 14 and the ground by piezoelectric components.