[sdiy] For Your Christmas Color Organ/Envelope Follower

mark verbos markverbos at gmail.com
Mon Dec 16 20:57:07 CET 2019

Wouldn’t this be more of a “seven band spectrum analyzer" than a "seven band graphic equalizer"?

just saying.


> On Dec 16, 2019, at 7:13 PM, MTG <grant at musictechnologiesgroup.com> wrote:
> Did we talk about this guy? It's not terribly new, but I'd never heard of it. 
> https://mix-sig.com/index.php/msgeq7-seven-band-graphic-equalizer-display-filter <https://mix-sig.com/index.php/msgeq7-seven-band-graphic-equalizer-display-filter>
> The interface is kind of funky, but here's the scoop:
> 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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