Cmos touch switch

Posted on Mar 8, 2013

This touch switch does not rely on mains hum for switching-It-can be used with battery powered circuits. Schmitt trigger IC1 forms a 100 kHz oscillator and IC2a which is biased into the linear region, amplifies the output and charges CI via the diode. IC2b acts as a level detector

Cmos touch switch
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When the sensor is touched, the oscillator signal is severely attenuated which causes CI to discharge and IC2b to change state.

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