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Capacitive Sensor Circuit - Printable Version

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Capacitive Sensor Circuit - PE1BMC - 06-01-2020

Hi All,

I have realized a very simple circuit that converts Capacity into Frequency that can be measured with Phyphox.
The basic circuit is an oscillator made up of 1/6 of an 74HC14. A small trick is used to feed the IC with the bias
of the microphone.
In fact you can use the 3.5 mm Jack to input triggers to the phone see attached reference sheet. Maybe also a possible input to Phyphox. ( The Timer would be nice... )