This small commercial radio for the MW band with germanium transistors was found in Japanese documentation from the 1960s. The circuit is powered by a 9 V battery and has a 455 kHz IF.
Found in an Elektor from the 90s, this circuit is based on components that are still common today....
Used in audio circuits in the excitation of output stages, this circuit provides audio signals with...
This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can...