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
Click here to download the full size of the above Circuit.

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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