Three band EQ for bass; any suggestions?

[Bernardduur]

Hi all. I wanted to build for my next project a active three band EQ for bass (bass, mids and treble control); searched the forum but didn't find any info on this topic. Any suggestions?

[Basstyra]

I'm interested too. I think it would be pretty easy, but I don't know where to start.

[Bernardduur]

Same problem

[lovekraft0]

Check this page - scroll down to the 3-band Active Baxandall schematic - IINM, it's verbatim from an old National Semi opamp datasheet, but the math's all there, so you can customize it as you like. You might also do a forum search for stm's active tone control schematic - I haven't got one built yet, but it's on the list, specifically for an onboard bass EQ.

[Bernardduur]

Thanks!

I've did a better search; see this:

http://diystompboxes.com/sboxforum/viewtopic.php?t=30867&highlight=three+band+eq+bass

and

http://burgundy.users.balpol.tudelft.nl/bin/schem/parametricbass1a.gif

[dpresley58]

Try this one...

http://www.diystompboxes.com/sboxforum/viewtopic.php?t=33100&highlight=ntmb

Someone recently de-potted a Bartolini NTMB 3-band active bass eq circuit. You can also go to the Bartolini website for an owners manual for additional information.

[lovekraft0]

These are the two posts from stm that I remembered seeing:
http://diystompboxes.com/sboxforum/viewtopic.php?p=157950&highlight=#157950

http://diystompboxes.com/sboxforum/viewtopic.php?p=158032&highlight=#158032

Not super simple, but very elegant, with minimal interacton - some serious thought went into these! And don't miss Jay Doyle's TimbreBox, a discrete gyrator parametric style.