Touch on-off electronic switch circuit diagram
Source: InternetPublisher:李商隐身 Keywords: switch circuit diagram power outage electronic switch touch Updated: 2020/02/02
If the copper covering layers 2 and 3 on the printed circuit board are touched in the circuit , the transistors VT2, VT3 and VT4 will be turned on and the indicator light LH will light up. If you touch the two contact surfaces 1 and 2, the transistor VT1 will be turned on and the indicator light will not light up.
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