This Japanese commercial radio with 5 transistors is from the 60s and is powered by 6 V. It is a conventional superheterodyne configuration with good performance.
This power control with SCR was found in Radio Electronics from April 1966. The components are...
Suggested by a 90s Radio Elecrtronics, this circuit is intended to supply mobile equipment of the time....
This circuit was found in a Popular Electronics from the 90s. The circuit with the 555 monitors the...