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.
Found in a 1964 Electronic Design, this circuit is intended to serve as a time base for cardiac...
A modulated (intermittent) siren, using the four gates of the 4001 integrated circuit is shown in the...
Other operational amplifiers can be used in this conventional filter that rejects only one...