Using a dual 555 CMOS this very useful circuit on the bench was found in the July 1998 Electronics Now magazine. The circuit is battery powered.
The presented circuit has compensation for cold junction. In addition to a voltage reference, it...
This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio...
This circuit from a 1988 documentation uses an NTC sensor to keep a greenhouse temperature...