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Old 14th February 2008, 07:54 PM   #1
diyAudio Member
Join Date: Jan 2008
Default 3 band eq with ballance and gain

im not sure which forum to post this on but i am trying to build a mixer for dj purposes
i know i could buy one but thats no fun and i would like it to be valve based with solid state source selection and also a cross fader with curve adjust this bit i may need to rob from a defunct mixer altho someone may know about optical liniar pots and how to adjust their curve
now to the eq i would like the maximum amount of attenuation possible 20-30 db with 12db or so boost with low mid and high cuts and gain controll and ballance
can anyone help with a good schematic
then i need to find good circuits for phono pre amps head phone amp and line pre amps all tube based
hopefully this should culminate in a one of a kind mixer
any help greatly appritiated but the more simple the better im no electronics wiz
many thanks
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Old 14th February 2008, 08:22 PM   #2
Minion is offline Minion  Canada
diyAudio Member
Join Date: May 2006
Location: Cowican Bay , vancouver island
Well I don"t know about a Tube based EQ but I have a couple schematics for Pretty good Active solid State 3 Band EQ that only use a single Opamp, I suppose you could add a tube input/output if you wanted....

Most tube amp tone controlls I have seen were passive so they would only cut frequencies and not Boost them so you should get a better responce with a simpler curcuit useing an active Tone controll.....

Click the image to open in full size.

What you want to build seems very ambitous, the best of luck to you...

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Old 15th February 2008, 12:04 PM   #3
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Join Date: Jan 2008
thanks for that
you are right i do like a challenge lol i have been trawling the net and came up with these circuits
has anyone used them or have any views on them at all
i cant seem to post the pics so i will post the link instead there are two 3 band eq s on here all tube bassed and alot of info to


many thanks
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Old 28th July 2011, 01:52 AM   #4
jsrfo is offline jsrfo  United States
diyAudio Member
Join Date: Jul 2011
Default Need a little help with this


I am an intermediate guitar effects builder and would like to adapt this to an effect that my partner and I have developed.

Not being really knowledgeable of IC chips, can you tell me what types of voltage should be applied at the VCC+ and VCC- pins?

I guess I am having a hard time, since most of what I have done has been a straight 9V or maybe 4.5V to one pin and ground to the other.

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