Equalizer KA2223 integrated circuit LA3600 or legs used to integrate the function and connections at the same 100Hz, 320Hz, 1kHz, 3.5kHz, 10kHz frequency range adjustments can be made. And single-channel mono equalizer circuit operating voltage from 15v DC 6V... Electronics Projects, 5 Channel Equalizer Circuit KA2223 LA3600 "audio control circuits, " Date 2019/08/02