This circuit, which controls both the temperature and the level of a liquid in a reservoir, was found in an Electronic Design from the 90s. The circuit is based on a double 555.
The integrated circuit used is not common today. The circuit is from the SGS linear integrated circuits...
This circuit includes the power supply from the power grid. We found it in Radio Electronics from...
This circuit was found in the April 1998 issue of Electronics Now magazine. The circuit uses...