Simple 1-tube receiver (T960E)

This 1V heater tube circuit was found on a Radio Craft from 1945. The circuit is for medium wave and can be used as a tuner.

1.2 V to 37 V regulator LM317 (CB15740E)
A current of up to 1.5 A can be obtained with this regulator circuit, whose output voltage will be...
Electronic Potentiometer (CB6320E)
This circuit was found in a 1970 IEEE publication. The circuit functions as a voltage controlled...
Light Relay (CB16583E)
This simple light relay circuit was found in a 1988 documentation. The base is the operational 741 which has...