This circuit was found in Mullard's 1960s transistor manual. The circuit employs contemporary germanium transistors and operates at 1.65 kHz.
We found this circuit in the April 1975 Radio Electronics magazine. The circuit has a latch and...
We found this sophisticated home alarm in a 1994 documentation. The circuit supports sensors of...
This circuit was found in the 1991 Electronics Experimenter's Handbook. It activates a relay when...