Includes power cable & mounting hardware. Uses quality parts: genuine Thonkiconn jacks, quality Alpha/Songhuei pots, & trusted branded caps. Calibrated, tested, ready to rock.
The idea is to feed the circuit two signals and depending upon which one had the higher frequency the ring of 4 LEDs would light up in a clockwise or anti-clockwise direction. The speed of rotation would indicate how close or disparate the frequencies are. If the signals have the same frequency then just one LED is lit.
