This circuit turns off a load after an interval of 8 to 80 seconds adjusted on the potentiometer. The circuit is from a Radio Electronics June 1970. The time depends on C1 and can be changed.
This circuit is a handset receiver that picks up the signal emitted by a coil under the rug or...
This circuit uses a capacitor to store energy. The capacitor is charged by closing S1 by a moment. Them,...
This circuit filters low frequency noise from the turntable motor. We found it in a 1989...