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DIY Stompboxes => Building your own stompbox => Topic started by: VimEFX2017 on January 04, 2018, 02:43:00 AM

Title: Fuzz Face Mods
Post by: VimEFX2017 on January 04, 2018, 02:43:00 AM
I was wondering of anybody has tried swapping the 100K feedback resistor for a Pot/vr?

If so how were the results?
Title: Re: Fuzz Face Mods
Post by: JustinFun on January 04, 2018, 03:53:07 AM
This is what the 'pinch' pot does on a Zvex Wooly Mammoth (although the pot adds resistance over and above the 100k, as it's in series with it). Apart from that, it's a fuzz face with a tone control. It adds gating and 'velcro-yness' It also makes the lower gain sounds a bit more interesting. Have a look at some youtube videos and you'll see the effect it has.

Alternatively, it's only a 10 minute job on the breadboard!

Title: Re: Fuzz Face Mods
Post by: antonis on January 04, 2018, 04:11:46 AM
Quote from: VimEFX2017 on January 04, 2018, 02:43:00 AM
I was wondering of anybody has tried swapping the 100K feedback resistor for a Pot/vr?
We wouldn't try such a risky deed...!!!  :icon_eek:

If you try it on your breadboard (simulators refuse to accept it..), do it using a long wooden stick, on your own risk..


More seriously, altering feedback resistor value results in altering Q1 gain and also altering input impedance (signal loading)
(both in a relatively small portion..)