Suggested by a 90s Radio Elecrtronics, this circuit is intended to supply mobile equipment of the time. The transformer data is given next to the diagram.
This simple circuit with SCR and unijunction transistor appeared in Radio Electronics magazine in July...
This circuit was found in a 80's Popular Electronics. The sensor can be any phototransistor. The circuit is...
This multi-output oscillator uses CMOS integrated circuits that are uncommon today, but they can...