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, March 13, 2017

Catalinbread Dirty Little Secret Mk. III (ish)

I've gotten a few requests for the Mk. III and found several good stock layouts on FSB, so I thought I'd go with a slightly modified version of the DLS Mk. III. This has an added presence control, as well as an onboard charge pump. It's designed for use in a 125B with top mounted jacks, and the pots are all board mounted. Here's the schematic the layout is based on for reference.


  1. Hi, As I do to alternate between 9v and 18v ?
    And can use J201 ?

    1. I think J201s will be ok. Just be sure to use sockets.

      Are you asking about a switch to go between 9v and 18v? You'd use a SPDT switch with lug 1 going to the +9v pad on the layout, lug 2 going to the DC jack/battery, and lug 3 going to the trace that connects to the drain of Q5 (you'll have to get creative wiring that in as there's not a pad for that).

    2. Sorry buddy, I actually wanted to ask:

      What is the purpose of the MAX1044?
      I can use the power supply of 9v and 18v ?
      And how to make the control of Super Lead and Super Bass .

      Sorry my ignorance friend

    3. Hi!

      The purpose of 1044/7660 is to raise supplied voltage from 9 to 18 volts and provide mOAr headroom for this circuit.

      You can omit chargepump if you already have 18v power supply.

      >And how to make the control of Super Lead and Super Bass .

      You'll have to tweak some values, add treble bleed cap to output vol and bunch of other stuff.
      I highly doubt you'll be able to make a compact and simple switch to jump from super lead to super bass, at least for this circuit.

    4. Thank you guy for clarifying my doubts =)

  2. hi, there's a way to do the super bass/super lead switch on this board?


  3. Friend: Verified! Sounds perfect with the 2n5457. Thank you for your work!

    1. Thanks for the information, and right now I'm going to buy the parts to make this pedal.. hahahah

  4. I have made it! I used soviet kp303a transistors & chip 7660.Thank you for your works!!!

  5. Hi, I made the pcb but I have an issue with bass control. It works only in the first part of the pot course. I check pot type (A1M) and it's ok. What could be the problem?
    Thanks in advance