[sdiy] 3 band EQ

[DAF]

FWIW, this has been the EQ cookbook/reference article for me and I found it 
very helpful:

http://www.geofex.com/Article_Folders/EQs/paramet.htm

hope this helps...

Dave




----- Original Message ----- 
From: "Derek Holzer" <derek at umatic.nl>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, October 17, 2008 11:21 AM
Subject: [sdiy] 3 band EQ


> Hey all,
>
> I'd be very grateful for a simple recipe for a 3 band EQ, such as those
> found in my favorite el cheapo mixer of all time, the Behringer 1604.
> Extra points for a sweepable mid, but that's not the point here. I just
> need something for a basic tone control, with a minimum number of pots
> (input gain, hi, mid, low) and parts (maybe a few op-amps), which goes
> from near complete attenuation up to maybe about +10 dB gain. My
> favorite part about the Behringer EQ is that it self-oscillates very
> well when put in feedback situations, so that would be nice too. And,
> like the Behringer, this EQ I want to build can be a bit dirty ;-)
>
> I understand the basics of making low and high pass filters, however the
> midrange has me a bit stumped, since I can't seem to come up with
> something that doesn't have a too-steep resonant cutoff. I know that
> some notches will always occur, but it would be nice if the sound
> closely resembled the original when all three tone controls are set to 
> 0dB.
>
> Keep in mind, I'm not an electronics engineer. However, I'm quite open
> to simple theoretical explanations as well as links to existing
> projects. In particular, the YuSynth Fixed Filter Bank has a simple
> explanation of how to do the low and high pass, even if the band passes
> there are much too steep for my purposes:
>
> http://yusynth.net/Modular/EN/BANK/index.html
>
> I also checked a guitar effect 3-band here:
>
> http://www.zen22142.zen.co.uk/Circuits/Audio/3bandton.gif
>
> which was very unsatisfactory...
>
> Thanks much for any suggestions!
> best,
> Derek
>
> -- 
> derek holzer ::: http://www.umatic.nl ::: 
> http://blog.myspace.com/macumbista
> ---Oblique Strategy # 52:
> "Do nothing for as long as possible"
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> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


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