This circuit with a voltage comparator is delayed by the capacitor. The circuit drives a power transistor that must be equipped with a good heat sink.
This circuit can operate with signals up to 60 MHz using the indicated operational. We found it in...
This circuit takes advantage of the noise generated at the reverse biased junction of a germanium...
Equivalent transistors can be used on this 80's circuit. Any general purpose PNP transistor can work...