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Building a Stereo Equalizer
Building a Stereo Equalizer
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Old 18th October 2011, 09:12 PM   #1
adam0892 is offline adam0892
diyAudio Member
Join Date: Oct 2011
Default Building a Stereo Equalizer


I am working on a project for class and am having trouble finding resources regarding building stereo EQs. I'm fine with IC and Op-amp designs but I don't want to have two sets of slider pots (one for each channel).

Can anyone point me to a good resource?
(I'm looking for 3-5 band parametric EQs)
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Old 18th October 2011, 10:27 PM   #2
mickeymoose is offline mickeymoose  Canada
diyAudio Member
Join Date: Nov 2008
Go to Ethan Winer - Home Page and navigate to the mag. articles section, than "Spectrum Analyzer...." Most you need to know is there! E
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Old 21st October 2011, 02:17 AM   #3
dangus is offline dangus  Canada
diyAudio Member
Join Date: May 2004
Location: Vancouver Island
One trick is to use VCAs (Voltage Controlled Amplifiers) to replace pots in a state variable filter. Analog Devices used to sell the SSM2164 quad VCA. Also check out THAT Corporation: Blackmer VCAs from THAT Corporation
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Old 21st October 2011, 03:33 PM   #4
stellavox is offline stellavox  United States
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Join Date: Jan 2007
Location: Oneonta, NY; USA
Try finding the National Semiconductor Audio Handbook. The second chapter - around page 50 has a thorough coverage of equalizers - especially pps 53-56. Or you can buy Douglas Self's new filter book.

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