This radio for the AM band has the traditional superheterodyne configuration with several transistors and integrated audio amplifier circuit. The circuit is from the 70s.
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...
Using a single Darlington phototransistor, this circuit drives a highly sensitive relay, for...
This source whose voltage depends only on the zener diode used, can supply currents up to about 3 A....