The integrated circuit used in this application is uncommon, but equivalent operational ones can be used. The circuit is from the Signetics integrated circuits manual from 1972.
This touch sensor, found in an American documentation on transistors, has gained 8 million times...
The block shown in the figure is a basic source with a configuration widely used in technical...
The output of this circuit must be connected to the input of an audio amplifier. The microphone is a small...