This circuit was found in American documentation from 1966, but it can be assembled with a modern equivalent transistor. The circuit is based on a mechanical tuning fork with a coil feedback system.
This receiver was found in a Japanese publication in 1967. The circuit uses germanium transistors and...
The connection of high-value input resistors causes the circuit to behave like a conventional...
In the figure we show a Varicap-controlled VCO capable of generating signals in the range of a few...