144 MHz Receiver (T365E)

Found in the 1961 RCA tube manual, this super-regenerative receiver uses 4 tubes and has a speaker output. The power supply is given.

Dimmer (CB3973E)
This brightness control for incandescent lamps or engine speed has been found in a 1970 English...
Load for Power Supply Test (CB1518E )
This circuit adjusts the drained current to values up to 20 A, allowing the testing of power...
DC Motor Control (CB5376E)
This PWM control circuit was found in an old documentation, but appears elsewhere on this site...