Found in a 70s RCA manual, this circuit uses a transistor of the time for an UHF L band oscillator. Details of the resonant circuit, which is critical, were not given.
This circuit using an operational amplifier was found in old American documentation. It can be...
If the circuit oscillates, emitting sound, it is because the transistor is good. This simple...
Like the previous circuit, this is used in the analog part of the telephone lines. The same...