Found in an old English publication, this circuit applies to the 240 V network, but can be changed to lower voltages. Transistors are mostly general-purpose, admitting modern equivalents.
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...