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.

Monday, October 12, 2015

Himmelstrutz Fetto

Here's an original design by Himmelstrutz Elektro Art, the Fetto. It's a heavy overdrive/distortion circuit using 3 JFETs (probably 2SK170GR, but the names were sanded off the original traced by SoulSonic). These have DGS pinouts, so they're not J201, 2N5457, etc. One of the unique things about this circuit is the number of removable jumpers on the circuit board. These can be removed to tweak the sound of the effect, along side several DIP switches and 2 trimmers. In the layout below, I've replaced the removable jumpers with DIP switches for easier tweaking. The only jumper that isn't on a switch (and I don't think it was removable on the originals) is the one in parallel with the 100nF output capacitor. Not sure why this one is there. You can check out the schematic here.


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14 comments:

  1. UnknownOctober 12, 2015 at 2:49 PM

    now this is a beatiful layout for a great pedal! I've done some of those in the past but ended up selling them to friends. I'll be building it for myself ASAP, and I recomend you to do it! It's one of the best sounding od's around!

    ReplyDelete
  2. UnknownOctober 12, 2015 at 2:50 PM

    and yes, it needs the 2SK170BL/GR to sound right. I tried a lot of different jfets when I built it, and others don't sound right (and the BL and GR sound different)

    ReplyDelete
  3. UnknownOctober 17, 2015 at 8:55 AM

    Yeaahhh Thank you
    Great work for a great od
    Thank you

    ReplyDelete
  4. GuilhermeFebruary 5, 2016 at 8:08 PM

    buddy, there's something wrong with this layout!


    It says "unverified". you can tag it, sounds fucking awesome!

    ReplyDelete
  5. Peter PanFebruary 29, 2016 at 12:52 AM

    Great layout. Thanks a lot for the great work. Can I take a 220nF instead of 200nF or should I take two 100nF parallel? I can't find any 200nF anywhere. Thanks a lot!

    ReplyDelete
  6. Peter PanMarch 2, 2016 at 3:33 AM

    Thanks! Would it be possible to get the Eagle file? Just saw a great offer, 10pcs of PCB for 25 EUR incl. If somebody is interested, we could order togehter, don't need 10pcs :)

    ReplyDelete
    Replies
    1. Effects LayoutsMarch 2, 2016 at 9:08 AM

      I don't use Eagle and don't have gerber files for the PCB. It's one of the few shortcomings of DIYLC.

      Delete
    2. Peter PanMarch 2, 2016 at 2:22 PM

      Okay, thanks :)

      Delete
  7. Peter PanMarch 3, 2016 at 12:09 PM

    Hell yeah, it is working. First Vero ever. Does anybody know what's the hardwire jumper for? Just want to put in a case before I can test the rest.

    ReplyDelete
  8. RingoJune 10, 2016 at 3:12 PM

    Hello,

    i like you`re layouts very much, so thank you very much for this work.
    I have a question about that linked schematic.
    What is that transistor, ...etc. after treble cut 3 doing, (D2, Q4, R13, D3)?
    I don`t get it, since there is no connection to output when footswich is on.
    Is it only for that LED? Is there a connection i dont see?
    Thank you in advance.
    Greets Lars

    ReplyDelete
    Replies
    1. Effects LayoutsJune 10, 2016 at 5:00 PM

      That's for the millennium bypass switching. There's a separate layout for that here on the blog.

      Delete

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