We found this circuit in the October 1987 Radio Electronics magazine. The triac must be controlled according to the heater. The transformer has a low current, of the order of a few hundred mA.
This configuration with the LM383 appears elsewhere on this site. The circuit shown was obtained...
This circuit was found in the May 1989 issue of Radio Electronics magazine. The circuit requires a...
This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1...