Based on Radio Shack 276-137, this circuit was found in the December 1995 issue of Electronics Now magazine. The circuit drives an LED but could use a relay instead.
We found this circuit at Popular Electronics. The components are still current. Changes can be...
We found this circuit on a Radio Electronics. Similar configurations can be found in this section. The...
s. In it, a set of batteries or battery provides the reference voltage for the output. The...