This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio Electronics magazine. The circuit is based on an LM324 and a sensor from that time.
We found this circuit at Popular Electronics. The components are still current. Changes can be...
We found this circuit in an American publication from the 1990s. The triac must be equipped with a heat...
Found in a Popular Electronics from the 1990s, this circuit uses components from National...