Previously I shared 40 led vu meter circuit using Audio Spectrum Analyzer, Spectrum Analyzer circuit 10 channels (32Hz, 1kHz, 2kHz, 4kHz, 8kHz, 16kHz, 64Hz, 125Hz, 250Hz, 500Hz) on a total of 400 LED’s Spectrum Analyzer circuit 12v DC voltage... Electronics Projects, Audio Spectrum Analyzer Circuit 400Led "analog circuits projects, led projects, " Date 2019/08/03