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.

Thursday, May 17, 2018

Run Off Groove Double D

Still a few Run Off Groove designs I haven't laid out yet, and this is one of them. It's based around the 4049 IC chip and features 2 channels of amp-like distortion. I've laid it out to fit in a 125B with dual footswitches. Bias Q1 to 4.5v and then adjust to taste as usual. More info, schematic and footswitch wiring diagram on the ROG site.


8 comments:

  1. can i make a request, please do a musicman sabre II preamp that i can use like a stomp pedal? pleeeaaasse....

    ReplyDelete
    Replies
    1. Sabrotone has stripboard layouts for guitar and bass versions of this on his website.

      Delete
  2. I had seen this circuit a while back. It might be something I'm looking for but I would want to add a tone stack to both channels. Where should I add that in?

    ReplyDelete
    Replies
    1. Easiest approach would probably be adding in a couple SWTCs just before the Volume controls.

      http://www.muzique.com/lab/swtc.htm

      You could also tack on a couple of the BMP tone stack boards in the same place. I'd recommend using the one with the gain recovery stage.

      Delete
  3. I have a couple questions:

    1- there is a 470uF electrolytic that appears in your layout that is not in the original schematic. is this for power filtering? if not, what is its function.

    2- there is a 100 OHM resistor in your layout in the power chain prior to everything in the circuit that uses power. this resistor is also not shown in the original schematic.

    PLEASE ADVISE.

    Thank you as always for this AMAZING resource.

    I visit DAILY and this website is a wonderful repository of knowledge.

    ReplyDelete
    Replies
    1. 1 - yes, power filtering. A lot of circuits that use the CD4049UBE chip have large power filtering caps.
      2- Also power filtering/smoothing, also present in a lot of 4049 designs.

      Delete
    2. I assumed as much.
      Thanks for the speedy response.

      Delete