Two Transistor Super heterodyne (CB20574E)

This circuit was found in an English publication from 1967. The circuit is for listening on a phone. Transistors are types of germanium of the time.

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Star Alternator (CB20067E)
In the figure below we have the typical circuit of an automotive star alternator with the...
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This circuit was found in a 1978 British magazine, but it can still be mounted by simply replacing the...