♔♔♔ 5 band graphic equalizer circuit diagram This circuit uses a single chip, IC BA3812L for realizing a 5 band graphic equalizer for use in hi-fi audio systems. The 5 band graphic equalizer is applicable for radio cassette players, home stereo systems and car stereo systems. This device features: low distortion and low noise, wide operating power supply voltage range (3.5V to 16V), low current dissipation (5 mA), wide dynamic range (VOM = 2.1Vrms/VCC = 8V), and built-in input and output buffer amplifiers.