Sunday, 7 May 2017

Emanating Fist Electronics Black Dust - Tone Distorter

From the captain:

Dig it. Black Dust. The Black Acid pre-set to fold air. Fuzz and drive, wide open. Maximum attack, minimized footprint. Fuelled with the same PCB as the Black Acid, British made Magnatec BC109's, Arcol carbon comps, BC/Vishay capacitors, prime cuts all the way.


For those not familiar with this circuit type it has a very similar tonal qualities to the old Meathead Dark though I'd say a more refined approach with a more traditional overall tone than that of any Meathead. The mids are quite flat the lows considerably boosted and the highs pretty natural and open sounding. Heaviness, it is some.



There were 2 versions, a big box version (older) and smaller (newer).

Big Box Version:


Small Box Version:


12 comments:

  1. Hell yes!!!! I'm in doom heaven today. Appreciate these EFE Layouts

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    1. lol. no prob man. nothing like a good heavy fuzz.

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  2. caught some errors. fixed the layouts and reuploaded them.

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  3. Built the small box version with a pair of BC108C. Verified. Have to give it a good run through still.

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    1. awesome man. i also made a correction to the big box version. after more investigating the big box version did not have the 220pF cap between B-C of Q1 so i removed it from the layout.

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  4. Sounds nice and heavy but a bit gated. Then again the demo does as well. It plays very well with my OR15. Thanks Zach.

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  5. Hopefully I will get a parts order in soon, I'd love to build the Black Acid but I was out of bigger vero. I think turning the fuzz down would work better with a dirty amp. My Germanium Fuzz Face and Tonebender Mk. II need to be turned down a little bit to sound better through the OR as well, so it's just an assumption.

    I'd also like to change what I said about it being gated. It IS gated but mostly through my AC10. The Orange had more sustain and a crazy sounding note decay. Very heavy.

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  6. Since I have this already built, would it be difficult to add a fuzz control to it? It's not as straight forward as swapping the 1k resistor for a pot and grounding lug 1, right?

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    1. Shouldn't be too hard. Replace the 1k resistor with a 1k pot just like a FuzzFace, lug 1 to ground, lug 2 to the +leg of the 22uF cap, and lug 3 on the bottom row. you need to move the leg of the 22uF cap that's on the bottom row up 1, and put a cut to the right of the input cap.

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  7. Awesome. I can pretty much make the Black Acid then. It sounds great as is but I think turning the fuzz down a bit would play better with the OR. I haven't been building too much lately and am running low on some stuff, so this is helps. I'm trying to get back into building and this thing just sounds awesome. I'll let you know how it goes, thanks again Zach.

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  8. I think the 100n output cap in the layout with the trimmer may need to start one row lower - should connect to the 560R and 2k2 resistors, rather than ground?

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    1. Yea I caught that before when I removed the 220pF cap, and thought I uploaded it the 2nd time, might have forgotten. I'll reupload it. Nice catch.

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