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.
We found this voltmeter in a 1977 Radio Shack documentation. The integrated circuit can be the...
This circuit with a maximum current of 50 mA was found in the August 1998 issue of Electronics Now magazine....
This circuit was found in the July 1994 issue of Electronics Now magazine. The relay can be rated...