Sunday, 7 May 2017

Emanating Fist Electronics Black Acid - Tone Distorter

From the captain:

The Black Acid is basically a fuzz face clone (circa 2012). It is a pool of thought and ideals. All the little iddy biddy nuggets of information learned from screwing around with this circuit over the last 10 years. Nothing revolutionary and no reinvention of the wheel just a different slice of the same cake.

The destination on the trip: The Black Acid has substantial weight and heavy saturation without having a complete strangle hold on the lower frequencies. It has the same perceived amplitude as the old Meathead Dark but with the lows being tighter with greater clarity. It has considerably more output than a stock Fuzz Face but I'd say that it retains more of the vintage nature than any of the Meatheads, I guess you could say the frequency spread is more even. The highs and lows are nicely balanced so the projection is good plus with the mids not being as forced the clean-up from the guitars volume control is very pleasant, though pleasant wasn't really plan here.

The construction style and the internal arrangement is the same as with the Priest. A much simpler circuit with components specially selected to get the job done. At the heart of the Acid is a pair of Magnatec BC109's. UK made transistors don't you know. A great quality component that really complements this circuit set-up. Even running flat-out and blowing the barn doors wide open there is cleanliness or crispness to the tone. Don't get me wrong, it's as sludgy as fuck but sludgy without having cotton wool forced into your ears.

The controls are pretty damn obvious but I'd say the rule of attenuation applies to this pedal, as in I'd advise starting out with the Drive and Fuzz controls wide open and them bringing them back to where you'd like be at. The Fuzz is as you'd find on any Fuzz Face or the Tone Benders Attack control, it's only really gonna kick-in with the heavy on last quarter of the turn. There be plenty of scope for cool tones and amp blending but if you want the heavy open it up. The Drive is basically the pre-gain of the pedal. It's like having your guitars volume control on the floor. The point of this is that it's a great way to un-flab the lows when you're driving the thing hard into the front end of a driven valve amp. It also gives up some great overdrive tones and just makes the box a whole lot more of a flexible tool. The Drive and Fuzz controls also have a pretty sweet interaction thing going off. The Black Acid ain't as 'yeah! lets fucking party!' as the Priest is on the controls front but put the time in and the rewards will be plentiful.





14 comments:

  1. Replies
    1. no. when i uploaded the layouts from an older version of DIYLC it moved some things and i didn't catch it. the layouts have been fixed and updated.

      Delete
    2. wow that was fast. thanks, im building right now.

      Delete
  2. Built and testing against my Meathead Deluxe clone. Similar feel, but the tone is different like it says on the description up top.

    ReplyDelete
    Replies
    1. sweet. cheers on the verification.

      Delete
    2. Done. Sounds great, no gating in the note decay like my meathead. Great OD when guitar volume is rolled back. Sounds best with fuzz cranked and the drive knob basically adds or subtracts wooliness. Love it. Used bc109b and 109c.

      Delete
    3. This comment has been removed by the author.

      Delete
  3. This comment has been removed by the author.

    ReplyDelete
  4. Is the trimmer strictly a tune-by-ear thing or is there a target voltage? Right now I have the voltage on the collector of (I assume) Q1 on 1.44 and it sounds about right.

    BTW I like this one. Thanks for the layout!

    ReplyDelete
  5. I have Bc108b. Should be better high hfe? 400 or 200 aprox?

    ReplyDelete
  6. I was somewhat underwhelmed with my build at first. Maybe I'll have to try out different transistors and mess with the bias. Any suggestions for what transistor hFE and biasing voltages to aim for?

    The fuzz also seems to be limited to the very last part of the rotation, so maybe a C1k pot could be better?

    ReplyDelete
  7. This comment has been removed by the author.

    ReplyDelete
  8. Is there some way I could do a transistor mod on this, like the switched transistor thing you suggested on the DAM meathead? If so, which transistor would I run to a switch- Q1 or 2?

    ReplyDelete
  9. Hi there, I built this but I'm having some trouble. The fuzz knob acts as a Tone knob as well, it sounds like the treble is rolled off everywhere except max. The drive knob is acting as a volume knob as well. The whole thing sounds fine when everything is maxed out, but sounds muted when anything isn't maxed out. What could be the problem?

    ReplyDelete