Capacitive toggle switch

230

01:55:24

Capacitance change is measured through the dielectric difference caused by a finger touch.

The increasing in the dielectric constant cause the voltage to drop initially. Therefore, a current can be measured through the sensing resistor and the op-amp.

The opAmp output then connects to a Schmitt trigger(implemented by an opamp) to be filtered.

Through a Cmos inverter, the signal ends up in the clock of the D latche based flip flop to satisfy the talking behavior.

published 2 years ago

Sheen140

11 months ago

Very cool circuit!

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