This circuit triggers an alarm in the event of a power failure. The circuit is from an 80's documentation, being powered by 9 V battery. The parts are common today.
March 2017 - Mouser Electronics is making available the new Olimex A20 OLinuXino single board...
This circuit has the coil tuned input according to the operating frequency range. The indicator can...
In applications where there is no danger of any contact with live points on the circuit by the...