We found this circuit in the October 1987 Radio Electronics magazine. The circuit uses a 1-to-1 turns ratio pulse transformer to trigger the Triac.
The basis of this project is a three-position lever switch or similar. When the switch is in the...
This physical line servo control uses components that are not currently common. The circuit is from...
This circuit was found in a Popular Electronics from the 90's. The power transistors must be...