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.
This very simple circuit must use coal microphones of the type found in very old equipment. The...
We found this circuit in the November 1974 issue of Radio Electronics magazine. The circuit has a...
July 21, 2015 - Mouser Electronics, Inc. is now shipping the Curiosity Development Board from ...