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Transforming a Tone Pot to a multiband Parametric EQ + Gain

PostPosted: 27 Apr 2014, 09:36
by Lord Metal
Hello,

I need some help with a Tone modification on the Big Muff Pi - Green Russian;

Transforming the Tone Pot to a 7 Band Parametric EQ with Frequency, Bandwidth and Gain Stages.


Any help is much appreciated :popcorn: :popcorn:

Hail Thunder Lord Metal

Re: Transforming a Tone Pot to a multiband Parametric EQ +

PostPosted: 27 Apr 2014, 11:58
by bajaman
:lol: :lol: :lol:

Re: Transforming a Tone Pot to a multiband Parametric EQ +

PostPosted: 27 Apr 2014, 21:27
by copachino
thats gonna be hard to find, para EQ are hard to build

Re: Transforming a Tone Pot to a multiband Parametric EQ +

PostPosted: 27 Apr 2014, 23:16
by DesertCruiser
Wow, that's a lot of bands for a guitar pedal. Probably wouldn't fit into a normal bmp box if just replacing the original tone control is what you had in mind.. Probably wouldn't use all bands anyway since the bandwidth of a guitar is much narrower than "normal" percieved bandwidth. I think a common James tone stack does a pretty good job in a big muff.
Anyhow, if you're into para EQs check out this article at geofex about that stuff http://www.geofex.com/article_folders/eqs/paramet.htm
i agree that it could be interesting to try a para EQ with guitar, but i think that it would be better to make a separate EQ pedal for that and maybe settle with 3 or 4 bands.
Good luck :)

Re: Transforming a Tone Pot to a multiband Parametric EQ +

PostPosted: 03 Oct 2014, 23:42
by idy
I think what our amigo should try is just putting a "send/ return" where the tone control is (even just a break out box) and then try some different equalizers. There are plenty of 7 band eqs out there.

Since there is no more clipping after the tone control in the BMP you could just, (maybe jumpering or removing the tone control for now,) add the eq after the pedal. Easy! Putting it before that final "make-up gain" transistor is unnecessary.

A 7 band eq is usually not parametric. There are verorboard layouts for 3 band parametrics, and that is a lot of knobs. You could try a "FMV" amp style tone stack.

People think you are crazy when you say "7 band parametric." That would be really pushing the boundaries, like at least 21 knobs plus 1 for gain. But putting a 7 band graphic eq in place of a tone control is a really good experiment.

Re: Transforming a Tone Pot to a multiband Parametric EQ +

PostPosted: 04 Oct 2014, 21:37
by guitarmageddon
I'm assuming that perhaps you're meaning a graphic eq.
I put a 5 band one in a fuzzface using a BA3812L ic. Works amazingly. Very difficult to mill an enclosure for the sliders though.
This may be of interest, though I'm not sure it has ever been built. :idea:

Image

Re: Transforming a Tone Pot to a multiband Parametric EQ +

PostPosted: 05 Oct 2014, 21:37
by induction
Graphic eq's don't have frequency and bandwidth controls.

I kinda assumed the OP was joking.

Re: Transforming a Tone Pot to a multiband Parametric EQ +

PostPosted: 05 Oct 2014, 23:44
by guitarmageddon
induction wrote:I kinda assumed the OP was joking.


I guess you're probably right :slap: