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 two-year-80s circuit consists of a solution for a small portable recorder powered by cells, as...
This circuit is from a 1992 Electronics Handbook. The circuit generates a special tone effect for...
The operational Amplifier used in this circuit is uncommon today. However, the same circuit can be...