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This circuit uses a single
chip, IC BA3812L for realizing a 5 band graphic
equalizer for use in hi-fi audio systems.The
BA3812L is a five-point graphic equalizer that
has all the required functions integrated onto
one IC. The IC is comprised of the five tone
control circuits and input and output buffer
amplifiers. The BA3812L features low distortion,
low noise, and wide dynamic range, and is an
ideal choice for Hi-Fi stereo applica-tions.
It also has a wide operating voltage range (3.5V
to 16V), which means that it can be adapted
for use with most types of stereo equipment.
The five center frequencies are independently
set using external capacitors, and as the output
stage buffer amplifier and tone control section
are independent circuits, fine control over
a part of the frequency bandwidth is possible,
By using two BA3812Ls, it is possible to construct
a 10-point graphic equalizer. The amount of
boost and cut can be set by external components.
The recommended power supply is 8V, but the
circuit should work for a supply of 9V also.
The maximum voltage limit is 16V.
The circuit given in the diagram operates
around the five frequency bands:
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