Will this work?

[LEON.01]

Thinking about building a new distortion pedal.
Found this layout for the MXR distortion +;



And was wondering if this tone pot mod would work on it;



Thanks in advance,

Leon.

[oskar]

that's a big muff tonestack. Can't fail...   

[LEON.01]

Thanks Oskar,

Boards cut, components all accounted for, 'Turns iron on!'

Will let you know how it goes.

Leon.

[petemoore]

  You might want to account for the passive losses in the TS.
  The Dist+ is known for not having 'sufficient' output, especially with lower threshold LED's.
  I haven't looked over the schematic to determine the +'s output impedance, additional amplification in the form of buffer or gain boost might be needed.

[ayayay!]

As always, Pete's advice is good on this one.  The tonestack will make your output suffer a bit.  If you still have enough output after the tonestack is added in, great.  If not, I'd add a simple buffer and see it that does the trick for you. 

[Ben N]

Or change your layout to use a double opamp, with a recovery stage.

[MikeH]

And check that layout- I used it a couple years ago and I remember there being an error on it; I think it was a trace that was supposed to be cut.  But it could have been fixed since then.

  You might want to account for the passive losses in the TS.
  The Dist+ is known for not having 'sufficient' output, especially with lower threshold LED's.
  I haven't looked over the schematic to determine the +'s output impedance, additional amplification in the form of buffer or gain boost might be needed.

And if you use LEDs as clippers you'll have plenty of output.

[MikeH]

Yeah- check the trace under the IC- the + side of that 1uf cap (I believe it's filtering vref) shouldn't be connected to that 10pf cap.

[LEON.01]

Cheers everyone! 

Yeah- check the trace under the IC- the + side of that 1uf cap (I believe it's filtering vref) shouldn't be connected to that 10pf cap.

Hi Mike, so i cut the track between the 10pf cap and 1m resistor, directly under the IC? or between the 1uf cap and 1m resistor?

Thanks Mike, made it earlier on and couldn't work out why it wasn't working!! 

[MikeH]

I believe it's the trace beneathe the IC, between the 1M res and the 10p cap.  Check a schematic to be sure.

[LEON.01]

Cheers mike, Found it in the end, all sorted now!