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 TTL divider divide by 0 to 9 the frequency of a signal applied to its input. Maximum...
Found in the American 73 magazine for radio amateurs, this circuit can test common quartz...
Found in a 1966 General Electric documentation, this circuit controls an incandescent lamp from an...