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.

Tuesday, October 30, 2018

Ibanez FC10 Fat Cat Distortion

Got a request for this one, it's a good addition to the collection. It's Ibanez's take on the RAT in their Power Series from the mid-late 80s. It's very similar to the LM7 LA Metal circuit, with just a few value changes and omissions (detailed below). I removed the FET switching and output buffer to simplify things. Here's the schematic for reference.

If you're interested in building the LA Metal, populate the board like this:


  1. Hey man! You are the greatest!
    Thank you very very much!
    I,m shure a lot of People ask you for a layout, i cant believe that you did. it in such a short Time!
    I,m going to Build this ohne as Soon as possible!!
    Once again: Thank you very very much!!

    Greetings from Austria

  2. Haleluja!!!
    first try, and it works like a charme!
    great alternative to a proco RAT, endless sustain, and a really rich warm distortion!
    welcome back in the 80ties!
    (i used the values shown in your layout only the 200r resistor is replaced by a 220r,and the 3,3uf cab replaced by a 2,2uf, thats what i had at home.)
    anyway this thing works great, and i think you can mark it as "verified"

    great job, and once more: thank you very very very much!!!!

    PS: during the weekend iḿ going to build the LA-metal too and then itś time to organize a "Huey Lewis-Cover-Project-Band" hi hi hi

    greetings from Austria

  3. Forgot: my Tone Pot ist a "b100k" and i changed lug1 and 3 ( so that it Works in ts style, Not as " Filter" like the rat)

  4. Got no 5534. Can you suggest me an alternative amp?

  5. hi everybody!
    has anyone buildt the "LA-metal" succesfully?
    the fat cat works great, but the la-metal creates an awful noise anytime i turn the volume up!
    it sounds like the signal is crancked in a strange way.......
    if somebody had luck with this one please let me know

    greetings from austria

    1. hi folks
      everythings fine! la metal works!!
      ( my fault......)

  6. What is the value of transistor?