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Simple Passive 3 Band EQ with Sweepable Midrange
Simple Passive 3 Band EQ with Sweepable Midrange
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Old 26th March 2016, 01:33 AM   #1
garybdmd is offline garybdmd  United States
diyAudio Member
Join Date: Jan 2016
Default Simple Passive 3 Band EQ with Sweepable Midrange

Hi all, I wanted to get any thoughts or suggestions about this circuit I made. It has an input and output impedance of 1k and 1k, so it works ok with mp3 player/phone to auxillary input in car, etc (10k input impedance). I also multiplied all the resistors by 100 and divided all capacitors by 100 and used it in a guitar distortion preamp pedal. The midrange sweep is a bridged t filter, and as the frequency increases, so does the q but the notch depth decreases. Practically speaking, it does seem to have utility as it will sweep a fair amount of the midrange even though its simple. Has anyone seen this used? My goals were to make the simplest passive 3 band with mid sweep. I also wanted the very low loss when all knobs dialed up.
I also put directions on how to make one without as much bass loss, published on page: Page not found - Gary Davenport Electronics
Thanks all for looking and suggestions.
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Old 8th February 2018, 12:15 PM   #2
curlewcat is offline curlewcat
diyAudio Member
Join Date: Dec 2017
Hi Gary,

I've been searching for info on super simple sweepable eq, not much around.

This looks perfect for me, I need to remove a 2.2Khz peak from my violins valve amp.

I see it's no longer on your website, did it work ok in the long run?

Why did you us a bridged T instead of twin T?

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