The purpose of this heat detector is to find hot spots on a board or other locations. The sensor is an integrated circuit from the period. The circuit is from Radio Electronics from May 1985.
In the figure we have the simple way of controlling a load or having a signal from an optical...
This circuit is from 1990 documentation. When we press D1 the lamp remains on for a time interval that...
Found in an Electronic Design from the 90s, this circuit makes use of integrated regulators of the time....