Seymour Duncan - Tweak Fuzz  [schematic]

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Seymour Duncan - Tweak Fuzz  [schematic]

Postby analogguru » 26 Jun 2007, 15:56

Here is the:

Seymour Duncan Tweak Fuzz schematic

SeymourDuncan_TweakFuzz.gif


enjoy,
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Postby modman » 04 Sep 2007, 00:35

"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)
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Re: Seymour Duncan - Tweak Fuzz

Postby lynessmy » 14 May 2008, 09:24

How are them compared? The link doesn't work...
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Re: Seymour Duncan - Tweak Fuzz

Postby BeAR » 17 May 2008, 08:59

Thanks to analogguru, I just built this stomp box. Schematic is spot on and sounds killer too!
Hope these help others. The ceramic on the bottom of the board just parallels up the 22pf on the top of the board as I didnt have a 47pf lying around.
Image

Image

Image
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Re: Seymour Duncan - Tweak Fuzz

Postby BeAR » 19 May 2008, 01:54

Just another quick update if anyone cares, Ive been playing around with the 2 transistors in the tweak fuzz and Ive found a better combination . Q1 is now a BC550 and Q2 is a BS170. This gives a tighter more focussed fuzz without the wooly bottom end when the tweak knob is wound arount to the 2.2uf cap.
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Re: Seymour Duncan - Tweak Fuzz

Postby marshmellow » 19 May 2008, 10:42

A BS170? You replaced a bipolar transistor with a switching MOSFET??
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Re: Seymour Duncan - Tweak Fuzz

Postby flood » 19 May 2008, 12:40

marshmellow wrote:A BS170? You replaced a bipolar transistor with a switching MOSFET??


:scratch: +1

holy p-n junctions, batman!
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Re: Seymour Duncan - Tweak Fuzz

Postby lynessmy » 20 May 2008, 02:55

What a nice PCB from BEar. I gonna make this PCB.

In fact, I had drawn one and tried on the weekend. But it doesn't work.
With the audio probe, i found that there are no signal passing thru the selectable CAP, no matter in which position.
Can anyone help me to understand what went wrong? I didn't pop in the 1M pull down resistor.

Image

Image
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Re: Seymour Duncan - Tweak Fuzz

Postby BeAR » 20 May 2008, 22:41

Yeah I know, strange but it works a treat. There is a discussion in the Workbench section about it. Some fets seem to bias just right as a direct replacement. As I said in that post, it shouldnt work, but it sounds better than any other option Ive tried.
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Re: Seymour Duncan - Tweak Fuzz

Postby iggy23 » 23 May 2008, 21:52

has somebody a vero layout???? :roll:
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Re: Seymour Duncan - Tweak Fuzz

Postby B3ar » 23 Dec 2010, 01:37

I got a good deal on a new Tweak Fuzz and am quite pleased with the implementation of SMD -- there are through-holes next to the SMD transistors and resistors, while the caps are already through-hole. Cheap to manufacture, easy to mod -- thanks, guys!

Folks mention that since it's a FF, mod accordingly, and apparently there's a popular easy variant on the Roger Mayer "volume" mods out there. (Remove R5, change R4 to 8k2.) I'm going to try some of the standard value tweaks over on R.G.'s Geofex page, especially those that are just resistor changes.

But I wanted to ask whether anyone has sub'ed out the stock SMD transistors, and whether it was particularly life changing. This is my first FF and I'm not unhappy with the base tone, but I want to be sure I'm not missing the boat.
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Re: Seymour Duncan - Tweak Fuzz

Postby holgar » 24 Mar 2014, 12:34

Thanx for the shem,
this Fuzz Face got the right name, because it is so easy to tweak.
For some more volume I lifted R4 to 1K. For biasing Q2 I took 10K at R5 (4,8V).
Instead of the useles C5 120n I took a Mullard 0,022uF, because I was missing a position 2,5 on the Tweak knob.
Of course the Mullard mojo oozes now through the whole circuit ;-)

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Re: Seymour Duncan - Tweak Fuzz

Postby biglouis » 02 Apr 2015, 22:49

Does anyone have the schematic?

The analogguru link is offline.
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Re: Seymour Duncan - Tweak Fuzz

Postby LooseCannon » 04 Nov 2015, 10:48

Same question here.

Does anyone have the schematic?
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Re: Seymour Duncan - Tweak Fuzz

Postby karul » 04 Nov 2015, 13:21

here it is
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Re: Seymour Duncan - Tweak Fuzz

Postby LooseCannon » 04 Nov 2015, 17:13

Thanks!
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Re: Seymour Duncan - Tweak Fuzz

Postby stilwel » 16 Mar 2016, 05:38

FYI....I believe Q1 and Q2 are mislabeled in the schematic. If you trace out the circuit, Q2 on the PCB is actually the input buffer transistor.

I have 2 Tweak Fuzz pedals here, both have Rev A PCBs. Maybe they changed it on a later revision?

Image

Anyway, I'm in the process of looking for some BC183 BC183C transistors for this beastie and discovered this tonight...thought I'd share.
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Re: Seymour Duncan - Tweak Fuzz

Postby ljn » 16 Mar 2016, 10:19

I just tried the resistor values suggested by holgar on my tweak fuzz. It sounds better than ever.
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