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, September 19, 2016

HAO Sole Pressure

Here's HAO's take on the Distortion +/250 Preamp circuit. It uses LED clipping and features a Brilliance switch for normal, bright, and warm settings. A TL072 dual opamp is used, but on the original, only one side is used and the other is left unconnected. In this layout, I used the unused opamp for the voltage divider to give more stability there.


9 comments:

  1. I bet the correct volume pot value is log

    ReplyDelete
  2. Sounds awesome!!! Greetings from Buenos Aires, Argentina.

    ReplyDelete
  3. the vol pot should be Log 100k, and the toggle doesn't really give significant differences

    ReplyDelete
  4. Hello guys ! super i'm going to make it !

    ReplyDelete
  5. It works great,and Its also sounding great with 1n34a diodes instead of LED's .

    ReplyDelete
  6. Verified, works better with 100kA vol pot. I'd try changin values for 1nF and 2.2 nF caps to get more contrast in the toggle switch function. Tried with TL072, KA4558 and JRC4558, the last was my choice, great sound.

    ReplyDelete
  7. Changed 1nF --> 470 pF, 2.2nF --> 4.7nF to get perceptible tonal contrast in brillance switch.

    ReplyDelete
  8. Total newbie here, looking to build this as my first pedal - How do I wire in a DPDT footswitch?

    ReplyDelete
    Replies
    1. On the General Layout Notes page there's a diagram for 3PDT. Google also has a lot of info on footswitch wiring.

      Delete