This circuit uses a transistor to trigger the alarm from a low quiescent current sensor. The relay is 12 V. The circuit is from Radio Electronics magazine, April 1975.
We found this circuit, which should only be used with incandescent lamps. In the Motorola Linear...
We found this circuit in the Radio Electronics magazine of May 1977. The circuit has the frequency...
This pulse-synchronized oscillator was found in a Mullard manual from 1960. The transistors are...