These 6 to 12 V source with current up to 100 mA was found in Radio Electronics magazine from June 19666. The source has a current indicator and uses transistors of the time.
This is the receiver circuit for the transmitter of the previous circuit using an integrated...
This simple continuity tester consists of an oscillator found in the 1983 Electronics Experimenter Special...
To power circuits with operational and TTL signals, the Radio Electronics magazine of March 1978...