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.

Wednesday, December 3, 2014

ProCo RAT ('86 version)

Since I did the Blower Box yesterday, and it's essentially a RAT, I figured it wouldn't take too much effort to convert that layout to the original. So here's the original '86 RAT.


  1. this thing sounds ridiculously great !, i did it stock but made 2 boards, next one is with the ruetz mod and mosfets clippers. its so versatile, can be used as overdrive, distortion and almost all out fuzz where bemded notes swell into the stratosphere !

    this is the true metal head pedal, the real one !

  2. for your reference

  3. Thank you so much for this great layout. It fits 1590A and I put a SPDT switch to choose Si or Ge diodes clipping. You works are so great and I keep build from your site. May I have a request? May you draw RoG Britannia layout? I really appreciate it.


  4. thanks,

  5. Dude, don´t get me wrong, RESPECT+++ for you! BUT why don´t you put a component list with the circuits? Would make a lot easier for us!

    Once again, RESPECT+++

  6. Howdy.
    Just built this lil fella. I'm getting a high pitched squeal when I turn the GAIN pot counterclockwise, and there is also a huge gain loss bump when 90% dialed clockwise... I read in 2 different places now that it's caused by the layout.. any one care to comment? thanks!
    PS awesome blog. can't thank you enough, mate!


  7. Hi!

    A bit late but...
    I fixed the problems below by wiring the thing a bit differently.
    The answer is in the GGG (general guitar gadgets) rodent wiring.

  8. Hello everybody,this effect sounds great. Thank you very much. Now, i must say that the Gain increase in a counterclock way, that´s wrong. Number one pin of Gain pot must go to cap5, r7 , r8 and ic2.

  9. Are the 2n4148s supposed to be 1n4148s?

  10. Hi.
    Any sub/equivalent for this layout replacing 2n5458 transistor?

  11. Hi.
    can i use 2SC1815 for this pedal?

  12. This comment has been removed by the author.

  13. Hi!
    the diode says "2n4148", is this an error? Because 2N are transistors, diodes are 1N

  14. Verified. It sound pretty good with TL071 and 2N2457