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.
We found this circuit in a Radio Electronics from April 1965. The components are from the time and the...
This old integrated amplifier is from a Japanese publication from 1972. The integrated circuit is...
This circuit is from an old European documentation, already influencing the unijunction oscillator that...