FM and VHF Transmitter (CB20572E)

Employing transistors of the time, this circuit was found in a documentation from 1963. The coils are according to the desired frequency range.

Analog Tachometer (CB1366E )
This circuit converts pulse frequency to current, which is indicated on an analog instrument. The...
Audio Relay (CB3968E)
This relay circuit with a dual channel MOSFET (not very common today) was found in an old American...
Signal Tracer with MW Radio (CB20509)
In the figure we have a simple signal tracer circuit to be coupled to the volume control of an AM...