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.
This circuit was obtained in an Electronics Now from the 90s. The circuit uses operational...
This circuit operates at a frequency around 1 MHz, having been found in a technical documentation from...
The TAA131 used in this circuit is not very easy to find today, but an equivalent low power audio...