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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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100Hz
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300Hz
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1kHz
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3kHz
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10kHz
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