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, July 30, 2015

Guitar Direct Box

Got a request for an active DI, which coincided with a project I'm working on, so it seemed like a good idea. This one's designed by Samuel Groner and modified by Jack Orman. The schematic came from his blog and can be found here, along with some other info about the circuit.


29 comments:

  1. From the link in the desctiption, it says "The “GND” point should be isolated from the chassis but Vee can be connected to chassis."
    Can someone explain it to me? I thought Vee and ground are the same in DC.

    ReplyDelete
    Replies
    1. That schematic was drawn a little strangely. GND in the schem is VR (yellow in the layout), and Vee is Ground (green). Wire it the way you normally would a pedal with VR (tube screamer, rat, etc). Hope that helps.

      Delete
    2. It did. I realized that a few moments before reading your reply, thank you for confirming it for me. I got the board all etched up. I still have to source components though. Hope to finish it this week.

      Delete
  2. Hi. I built this and it works reaaally nice. You can mark it 'verified' unless there's other requirements to that. I really don't know. xD

    ReplyDelete
    Replies
    1. That's enough for me. Thanks for verifying!

      Delete
  3. hello.. i'm a newbie here.. is there a schem for ground lift and speaker through for this d.i. box?

    ReplyDelete
    Replies
    1. Ground lift wasn't included in the original schem, but I think all you'd have to do is add an on/off (SPST) switch between ground and the X pin of the XLR out. For speaker through I think all you have to do is add a 1/4" jack and wire it to the input.

      Delete
    2. thanks for your reply.. really appreciate it..

      Delete
  4. i made this box and i don't know how to use it.. sorry for me..

    ReplyDelete
    Replies
    1. https://www.google.com/search?espv=2&biw=1401&bih=885&q=What+is+a+Direct+Box%3F

      Delete
    2. the input is where the speaker out or the line out of the amp inserted?

      Delete
  5. i can make a diy pedal but don't know how to use this thing.. sorry..

    ReplyDelete
  6. Any chance you draw a layout for a ABC box like the Morley ABC Selector? http://www.morleypedals.com/abc09es.pdf
    Thanks!

    ReplyDelete
    Replies
    1. Don't really need a board for one of those. Just wire it point to point like this:

      http://i38.tinypic.com/4zzqxu.jpg

      Delete
  7. At GND wire 370R 1/2W resistor in parallel 1UF/ 630V non polarized, add a switch for LIFT/ Ground. I do that to kill ground loop, I will try in VEE to see what happens.

    ReplyDelete
  8. is it working with phantom power from mixing console ? how to put some led indicator there ?

    ReplyDelete
    Replies
    1. This isn't designed for use with phantom power. You'll need to connect it to a 9v supply. If you're wiring it with an on/off switch follow the typical off board wiring.

      Delete
  9. Hello i'm a newbie for this and i want connect this layout to my pc soundcard and my wiring is guitar - pedal - Split L and R - two Direct Box (your layout)for R and L - Stereo Line in my pc soundcard so this is right or wrong ? or i must need balance to unbalance converter ??..

    ReplyDelete
  10. I would split the signal after the direct box using either a XLR to stereo cable. The balanced out pads on the layout is for the XLR output jack, and unbalanced out pad is for 1/4" output jack.

    ReplyDelete
  11. i made this layout but i dont know how to wiring it.... can i use the balanced output with an stereo jack instead of the xrl???? i want to use it with the pc soundcard so i need an output jack....

    ReplyDelete
  12. My 10R resistor has burned when I turned it on. Any idea on what could have happened??

    ReplyDelete
    Replies
    1. Sounds like polarity may have been reversed on your power supply.

      Delete
  13. This comment has been removed by the author.

    ReplyDelete
  14. Hello, is it compatible with bass?

    ReplyDelete
  15. Friend: is wrongly verified, R9 and R10 are GND, correct to VEE and works correctly. Thank you for your work!

    ReplyDelete