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Principle and Circuit of Single Metal and Resistance Bridge

2016-05-15 08:47  
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Principle and Circuit of Single Metal and Resistance Bridge Touch Switch
Singal Metal Touch Switch's Principle and Circuit Work's PrincipleThe circuit shown in the picture 1 only uses a piece of sheet metal.The circuit adoptes two pieces of Schmitt triggers 4093(There are four same ends but only two of them are input ends in the circuit,such as CD4093 and TC4093.).Usually,the diode LED1 does not spark whenthe third feet of IC2-a output terminal is in low PWL.And the output terminal changes into high PWL when it touches sheet metal,which makes the LED1 glow.The figure 2 is similar to figure 1 and it uses less devices and contorl the voltage by outputing electric keys directly.