Volume expander amplifier (T364E)

This circuit was found in the 1961 RCA tube manual. The circuit includes a power supply stage.

Code Practice Unijunction Oscillator (CB1430E )
e find this circuit in documentation for radio amateurs of 1974. The unijunction transistor can be...
Electronic Ignition (CB6385E)
This circuit was found in an American 1960s documentation. The circuit uses transistors of the...
Metronome 1 - 4093 (CB6889E)
In the figure we have a circuit that produces interval pulses, reproduced in the piezoelectric...