With this circuit it is possible to select transistors and their compliant test. Or circuit consists of an oscillator. Or transformer of the type found in old transistor radios.
This simple field strength meter was found in a 1967 documentation. The transistor is germanium, and the...
This is yet another version of the light-controlled oscillator that can be found on this website. This...
Found in a 1969 documentation, this circuit for the 20 MHz band does not use a transformer. The circuit is...