[sdiy] distortion pedal for a modular system

[Quincas Moreira]

The Frequency Central Meth Amp module I build recently is basically a Big
Muff adapted to modular, and it is prone to the same bleed through
problem.  I found that it is worse on some PSUs than others. In My Arturia
Rackbrute it is silent, in my LM317/337 based linear supply it picks up all
of my VCOs a lot.  My solution was to give it's very own small PSU, a
little meanwell DC DC converter. However,  I suspect that sub regulating
the 12v to 9v solves two problems:  It adapts the design without any
component value changes, AND isolates the circuit somewhat from the main
PSU. I have yet to try this myself but I think it's worth a try.

On Tue, May 1, 2018 at 8:59 AM, Walker Shurlds <walkershurlds at gmail.com>
wrote:

> On May 1, 2018 1:28 AM, stepan kayukov <stepan.kayukov at gmail.com> wrote:
>
> Hi Walker,
>
> Thank you for the advice. It definitely sounds different than it would on
> a guitar, but I still like it. The real problem arises from hearing things
> at the output of the distortion, even when nothing is at the input.
>
> The R7/C1 distortion and the way the JFET is coupled created a kind of
> gating effect that I was fond of, but if you think it might be the reason
> for the overall bleeding, I should try it the more conventional way.
>
> Both of your suggestions are very helpful. I will try them immediately.
> Since I am new to this list, I do not know if I should post afterwards.
> Should I give an update?
>
>
> Yes, please update us! I think even if you leave C1 and Q3 as they are,
> but add some small resistance in that branch between C1 and R7 it could
> reduce the gain just enough to reduce the noise. Another thing you could
> try is increasing R8. There should be a value high enough that Q1 gets
> biased all the way off—this changes the sound pretty drastically (sounds
> kind of 8-bit) but makes it completely silent when there’s no input.
>
> On May 1, 2018, 8:35 AM -0500, Joe Frey <frey at radioles.com>, wrote:
>
> The best distortion pedal(and I have built several) I ever built is the
> harmonic percolator. You can get the PCB layout and build info if you
> search pepper spray distortion. Be advised that one of the transistors
> connections are listed backwards. I used components for the original
> version, not the Steve Albini version. JoeF.
>
>
> I made one of the Tim Escobedo all-silicon version (but added the diodes
> back in switchable) and it sounds pretty great with synth. This would be a
> pretty good candidate for a module since the "harmonics" knob is just an
> attenuator.
>
>
>
>
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>


-- 
Quincas Moreira
Test Pilot at VBrazil Modular
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