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.
This circuit can act as a receiver for the transmitter of the previous circuit. We found it in...
This circuit, which can generate voltages up to 25 V, was found in the December 1992 issue of...
Found in a 1966 Electronics World, this circuit applies to the protection of any analog...