As shown in the figure, the circuit includes a one-shot trigger and an integrated sound circuit for the touch game. When the metal piece "nose" is touched, a piece of music is automatically played. Swimming Headset,Headphone For Swimming,Ipx8 Swimming Headphones,Best Headset For Swimming SUNSHINE ELECTRONICS TECH. CO., LTD. , https://www.benefitucx.com
555 and R1, C1 form a one-shot trigger circuit, the circuit is in the state to be triggered, and the 3 pin is low. When the human body touches the "nose", the 555 is turned over and enters the temporary steady state. The temporary stabilization time is td=1.1R1C1, and the pulse width corresponding to the graphic parameter is about 10 seconds. During the transient stabilization period, the high level of the 3-pin output is added to the IC2 power supply to play the music. Any music integrated circuit can be used, but pay attention to the power supply voltage.