This FM receiver tuning step circuit was found in a 1960 documentation. No information about the coils is given, but the FI used at the time was 10.8 MHz.
With this circuit it is possible to modulate a small signal in amplitude using a common germanium...
This audio amplifier with differential input steps is designed to operate with asymmetric sources...
Found in a book on transistors from 1954, this circuit can modernly be used as a relay shield. A 1k...