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Author Topic: Fuzz face input and output caps
soggybag

Posts: 84
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Post Fuzz face input and output caps
on: February 17, 2013, 18:24
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I'm in the process of building a couple fuzz face clones. I notice the input and output caps are a little weird. The input cap is really huge at 2.2uf and the out cap seems a little anemic at .01uf. Anyone have any thoughts or recommendations?

I keep thinking why 0.1uf for both? Of course probably best to test.

bear

Posts: 153
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Post Re: Fuzz face input and output caps
on: February 17, 2013, 20:14
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Those values are remarkably persistent, even in the current Dunlop line of specialized FF's. You can try trimming the input to 1.5uF or even 1uF to really trim some flab.

Some variants of note:
Colorsound "One Knob? Fuzz: .1uF in, .22uF out.
Early Vox Tonebender: .15uFin, 0.0047uF out.

soggybag

Posts: 84
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Post Re: Fuzz face input and output caps
on: February 17, 2013, 22:49
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I might have to experiment here. I'm going to build a couple boxes. Maybe I'll go with a .1 in and output in the first box and give it a listen.

Moving the input cap down to a 1µf cap let's you get away from the polarized electro caps, which are bulky.

soggybag

Posts: 84
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Post Re: Fuzz face input and output caps
on: February 24, 2013, 22:43
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I built two Fuzz Faces, bog standard parts except for the input caps. The first used standard values. while the second used 0.1µf input and output caps. The standard 2.2µf input cap and 0.01µf output seem a very strange combination. the 0.1µf caps seemed to move the frequency more into the mid range while remove a lot of the low end woofiness.

I experimented with a three Tone Bender builds also. Here I built a standard 4.7µf and 0.01µf, then a 2.2µf and 0.056µf, and last a 1µ and 0.47µf. With the Tone Bender the difference was not as notable. Couple be because of the 0.1µf cap that bridges the first transistor with the other two.

Overall I'd recommend everyone should play with these input caps. It's a super easy substitution that makes a very audible difference.

bear

Posts: 153
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Post Re: Fuzz face input and output caps
on: February 25, 2013, 12:05
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I shoulda mentioned the Tweak Fuzz from Seymour Duncan earlier, schematic at link: https://analogguru.an.ohost.de/193/schematics/SeymourDuncan_TweakFuzz.gif

It's hardly different enough from a normal silicon FF to bear notice aside from the switchable input caps. A bit subtle from position to position but the switch does give useful control of tone and feel. Handy if you don't want to collect Fuzz Faces for different playing situations and moods.

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