This electronic rheostat with SCR was found in the June 1964 Radio Electronics magazine. The SCR may be a modern type and the 2W potentiometer may be 470 ohms.
We found this circuit in a Radio Electronics issue from August 1970. The circuit drives a 12 V...
The photo FET is not a common component today. In this 1964 Electronic Design application we have a light...
This circuit can provide both positive and negative voltage outputs from 2 to 12 V with current up to...