BA3812L graphic equalizer circuit diagram
Using BA3812L equalizer circuit you can build is a five-point graphic equalizer circuit that has all the required functions integrated into one IC.
Main features of the BA3812L graphic equalizer circuit are: 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), built-in input and output buffer amplifiers.
For Ba3812L equalizer circuit we need just few external components to set the desire frequency for five point graphic , this circuit employs two capacitors, a potentiometer, and a bias capacitor as external components, everything else is on the chip.
Using one BA3812 circuit we can make a 5 band graphic equalizer , but if we use more chips two or three we can make an ten bands graphic equalizer ( using two ICs) or seven bands stereo graphic equalizer ( using three BA3812 chips ) .
The resonance frequency (fo) and the Q of the circuit are fixed by the values of the external capacitors and can be calculated using the following formula :
R0=1.2k and R1=68k internal resistors . Q is the factor that determines the bandwidth of the frequency . If the amount of boost and cut are the same for the same resonance frequency, the larger the value of Q, the narrower the resonant frequency band.
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