Page 1 of 1

Seymour Duncan - Tweak Fuzz  [schematic]

PostPosted: 26 Jun 2007, 15:56
by analogguru
Here is the:

Seymour Duncan Tweak Fuzz schematic

SeymourDuncan_TweakFuzz.gif


enjoy,
analogguru

PostPosted: 04 Sep 2007, 00:35
by modman

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 14 May 2008, 09:24
by lynessmy
How are them compared? The link doesn't work...

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 17 May 2008, 08:59
by BeAR
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

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 19 May 2008, 01:54
by BeAR
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.

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 19 May 2008, 10:42
by marshmellow
A BS170? You replaced a bipolar transistor with a switching MOSFET??

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 19 May 2008, 12:40
by flood
marshmellow wrote:A BS170? You replaced a bipolar transistor with a switching MOSFET??


:scratch: +1

holy p-n junctions, batman!

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 20 May 2008, 02:55
by lynessmy
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

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 20 May 2008, 22:41
by BeAR
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.

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 23 May 2008, 21:52
by iggy23
has somebody a vero layout???? :roll:

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 23 Dec 2010, 01:37
by B3ar
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.

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 24 Mar 2014, 12:34
by holgar
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 ;-)

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 02 Apr 2015, 22:49
by biglouis
Does anyone have the schematic?

The analogguru link is offline.

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 04 Nov 2015, 10:48
by LooseCannon
Same question here.

Does anyone have the schematic?

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 04 Nov 2015, 13:21
by karul
here it is

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 04 Nov 2015, 17:13
by LooseCannon
Thanks!

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 16 Mar 2016, 05:38
by stilwel
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.

Re: Seymour Duncan - Tweak Fuzz

PostPosted: 16 Mar 2016, 10:19
by ljn
I just tried the resistor values suggested by holgar on my tweak fuzz. It sounds better than ever.