This circuit was found in a 1970 US publication. Transistors are still common and the circuit can be used as a PWM shield or pulse transmission modulator.
This circuit uses an audio output transformer found in old transistor radios. Power output is...
Found in a 1967 Electronics World, this circuit uses unusual components today. The transformer has a high...
This circuit consists of a charge pump with positive input and negative output. We find it in a...