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.
The integrated circuit used in this regulator is not very common today. The circuit is from old...
This tone control was obtained in the Audio Handbook of the National Semiconductor of 1977. The...
We find this circuit in an American 1980s documentation. The circuit can still be assembled...