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Old 5th February 2014, 03:50 PM   #1
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Question Did I put these back in the correct spots?

I pulled all the pots off this four band Parametric EQ board to clean them and I thought all of them were 22K. But of course I screwed myself, like normal. OK, I think the gain pots are correct but I'm not sure of the parametric pots.... AAAAHHH. F#@% me running Click the image to open in full size..

I've looked for similar schematics but they are all different.
So I drew one, it only shows the rt channel.
Any help would be greatly appreciated.
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Last edited by 90scaraudio; 5th February 2014 at 04:00 PM.
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Old 6th February 2014, 04:24 AM   #2
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That looks right to me.All the ones Ive seen use lower ohm values on the higher frequencies.I believe they are lower because it makes the Q factor higher.The lower frequencies usually have a lower Q then the higher ones.The only way to be positive though is to go to TI's Filter Pro and start plugging numbers.But that can be time consuming.

If you really want to improve that EQ swap the TL072's for the BB OPA2134's.

I just looked at a Directed 4500 I have and it has 3 200k's for the lower 3 frequencies and a 20k for the high.The caps are different but so are the frequencies.
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