This filter that rejects a frequency range determined by the double-T was found in the August 1993 Electronics Now magazine. The source must be symmetrical.
August 2016 - Mouser Electronics is supplying the microcontrollers IF C1000 Intel Quark that...
This circuit, from a 1988 publication, consists of a timer that activates a relay at the end of a...
We found this circuit in the October 1990 issue of Radio Electronics magazine. The frequency can...