This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics magazine. The source must be symmetrical. The capacitors can be changed for other frequencies.
These reset circuits when the power is turned on were found in an 80's EDN. The circuit also...
This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency...
This circuit can be used in a power grid remote control project with the coil according to the...