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 oscillator for the fifth overtone of a crystal was found in a Radio Electronics magazine from...
Found in an American publication from the 1970s, this circuit makes use of unusual components...
This circuit was found in the September 1984 issue of Radio Electronics magazine. The frequency is given...