This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of analog televisions of the time. The integrated circuit used is uncommon today.
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...