This is the typical circuit of a local oscillator for a superheterodyne FM receiver. The circuit was found in a 1980s documentation and is typical of early and early receivers.
Found in American documentation from the 90s, this circuit has the signal frequency determined by...
This two-transistor regenerative switch works as an excellent trigger for SCRs and other devices that...
This receiver for listening to headphones and 2-battery power was found in Japanese documentation from the...