In this circuit the triac conducts when switch S1 is opened. We found it in the October 1987 Radio Electronics magazine. The triac is controlled according to the load.
The integrated circuit used in this project is unusual and it includes internal transistors that...
Originally this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
Found in an Electronic Design from the 90's, this circuit supplies voltages according to the...