Found in documentation from the 1970s, this reducing regulator uses integrated circuits and transistors of the time.
This circuit was found in a 73 amateur radio magazine from the 90s. An LED extends the scale from 0...
This small inverter that produces high voltage from a 6 V source was found in an American...
This circuit was found in a 1967 Philips publication. Transistors support equivalents and modern...