We found this circuit in the May 1996 Electronics Now magazine. The relay must have a voltage according to the circuit power supply and a trigger current of no more than 50 mA.
This circuit was found in the January 1991 issue of Radio Electronics magazine. The circuit uses...
We found this circuit in a NASA documentation from the 1980s. The circuit is based on operational...
This battery-powered emergency light circuit was published in an April 1962 Radio Electronics...