This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Thursday, January 8, 2015

EHX Big Muff - Green Russian

With the exception of the IC BMP ('77, '78) you can theoretically build just about any version of the Big Muff on any other version's layouts, but the values listed in this one are for the Tall Font Green Russian version. This one is smaller than the BMP layout I did with on board pots and you should be able to fit it in a 1590B if you shave down the sides of the board a little.

One of the better sounding versions of the Big Muff (IMHO anyway) and sounds great on both guitar and bass.



And if you want to cut through the mix a little better, here's the Green Russian with a modified tone stack, adding a mids control. Pinkjimiphoton over on FSB suggests using a higher value pot for the mids control (250k-1M) than the normal 100k that's listed. 


Update 3/16/15:
Modeffected pointed out that these 2 layouts were missing the 12k resistor from the power rail to the collector of Q3. Both layouts have been updated and should be correct now.

13 comments:

  1. what's the dimension of pcb? i want to make one pair of pcb of your's page but i don't know the size, sorry for my english . thank's :)

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    1. It's 2.3 x 1.3 inches or 58.5 x 33 mm. Good luck with the build and let me know if it works for you.

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  2. on the stock green pcb layout is a missing resistor that should go from the power rail to the collector of the third tranny from the left.
    i put it under the board as i was troubleshooting and it work as it should.

    when i look at the layout with the mids add-on, the same resistor is missing.

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  3. Thanks for catching that. Updated the layouts.

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  4. Verified (mids control version). Very Nice tone!!

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  5. i have to say this is the best version of big muff out there. also, verified.

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  6. Dumb question, where is the "out" pin in these two boards?

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    1. It's in the notes on the bottom left. Output comes off the 2nd lug of the Volume pot.

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    2. Thx! I don't know how i missed that, as i said, dumb question :)

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  7. I'm into this one!
    The "mids" knob add in parallel the 47nf cap to the 3.9nf one, am I right?
    So, I can play with that value

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    1. They're not really in parallel, as the Mids pot is really before the 47n cap, but yes, that 47n value can be tweaked for the mids.

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  8. Built this, and it passed signal right away. All the pots work, except it barely distorts. When I pull the first transistor, nothing happens with the sound, could this mean I have short? Possibly the 500p is bad?

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    1. Yeah, something is definitely shorting. Time to pull out the multimeter.

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