The seven band graphic equalizer IC is a CMOS chip
that divides the audio spectrum into seven bands,
63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and
16kHz. The seven frequencies are peak detected
and multiplexed to the output to provide a DC representation of the amplitude of each band. No external
components are needed to select the filter responses. Only an off chip resistor and capacitor are
needed to select the on chip clock oscillator frequency. The filter center frequencies track this frequency.
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