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Cmos touch switch

2015-09-01 14:10  
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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

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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