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 useful circuit is used to test the insulation of cables, appliances, leaks in high voltage...
This circuit was found in a Texas Instruments linear application manual from the 1990s. The...
With this circuit it is possible to select the upper or lower side band on an SSB transmission by...