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.

Friday, December 12, 2014

Earthquaker Devices Crimson Drive (2-knob version)

Here's a good sounding overdrive from Earthquaker Devices. This is for the first incarnation of the Crimson Drive with just level and gain controls. Uses a J201 in a buffer stage and a PNP AC128 in the gain stage.



Dirk_Hendrik from FSB traced one and drew this schematic.


The power filter section makes me scratch my head a bit, as it uses 2, 100µ caps. To keep things a little simpler on the board I just put one 220µ cap, since the equivalent capacitance of two parallel capacitors is the sum of the individual capacitances.

Also note that the schematic calls for a low current LED, hence the 10k resistor from the power supply. Change that resistor to around 2.2k if you're using a more common LED.


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16 comments:

  1. constantineaudioDecember 11, 2015 at 4:38 PM

    Verified.I built it with ac117 transistor. But there is a little bit hissing and noise, when i turn it on with my usual 9v power supply, anyway, pedal working well with battery. Thanks.

    ReplyDelete
  2. constantineaudioDecember 12, 2015 at 11:20 AM

    https://www.youtube.com/watch?v=owzxDfCsZL8

    ReplyDelete
  3. Effects LayoutsDecember 14, 2015 at 9:22 AM

    Nice! Thanks for verifying.

    ReplyDelete
  4. IvMMarch 12, 2017 at 3:39 PM

    I'll try with 2SB54 and add Rat's filter.
    Where do you suggest to add it? right after the diodes clipping? or after C6?

    ReplyDelete
  5. IvMJuly 9, 2017 at 9:09 PM

    Finished!
    Used one 2SB54, very confusing about the 1N4148 and 1N4007 :-D
    Sounds AWESOME

    ReplyDelete
  6. andrea83June 19, 2018 at 2:42 AM

    Hi, adding a 100 ohm resistor in series with the 9v reduce a lot of hiss and noise. It's simple to add if you get rid of the 10k for the led. And in my experience much transistor leakage makes some problems. Thank you for the layout! Very nice pedal!

    ReplyDelete
  7. danyJune 30, 2018 at 12:08 PM

    Instead of the 15K resistor put a 50K trimpot between the collector of Q2 and the ground; this way you can adjust the bias of the transistor. Before biasing I had a gated sound,after bias it was nice and smooth

    ReplyDelete
  8. Anibal BáezJanuary 4, 2022 at 7:52 AM

    This comment has been removed by the author.

    ReplyDelete
  9. Anibal BáezJanuary 4, 2022 at 7:53 AM

    This comment has been removed by the author.

    ReplyDelete
  10. AlreadyinDrugMay 17, 2022 at 8:34 PM

    cap 100uF from ac128 is reversed

    ReplyDelete
  11. BROUFACTORYJune 14, 2022 at 12:54 PM

    Hello! First, thanks a lot for what you did here. Next, do the pedal will work with 1n34? (i'm waiting for my next order)
    Pierre

    ReplyDelete
    Replies
    1. Effects LayoutsJune 15, 2022 at 5:39 PM

      It will, but won't quite sound like the original. 1N4148s would be another good sub.

      Delete
    2. PierreJune 17, 2022 at 2:48 AM

      You're right. It sound but not like the original. Juste a crunch. I will try with 1n4148. Thank you !

      Delete
  12. AlexOctober 5, 2023 at 12:26 PM

    Hello, thank you for the great layout!!! I made this pedal, installed a 50Kohm trimmer on the collector of a germanium transistor, and it's cool! With several PNP transistors, you can endlessly experiment with the sound. I stopped at GT403.

    ReplyDelete

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