This circuit was found in an old GE manual. It uses a thermocouple as a sensor. The SCR must be in accordance with the power of the controlled load.
daptation of a common multimeter for the measurement of high voltages with high input resistance,...
The sensor for this alarm is a thin wire that, when interrupted, triggers a buzzer and turns on a...
This 3 A adjustable source uses the LM350 integrated circuit, which must have a good heat...