We find this circuit in American documentation from the 1980s. It consists of a frequency folder using a varicap. The capacitors and coils depend on the frequency of operation.
This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the...
This simple 3-channel passive mixer can be used with low-intensity signal sources but requires...
We find this circuit in a 1974 Motorola PUTs (Unijunction Programmable Transistors) documentation. The circuit...