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.
We find this circuit in an 80's EDN. The circuit can be used with equivalent operational,...
This full-wave circuit was obtained in Motorola's 1974 unijunction transistors manual. The circuit...
This circuit was found in Motorola documentation from 1966. The lamps are according to power and...