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Tuesday, May 28, 2019

Bass Direct Box

Got a request for the DI portion of the Hartke LH1000 bass amp. This is more or less that, but with a simplified power section. In the amp this runs off a bipolar 15 volt supply, but I would think it would also work with regular 9 volt supply. There's not an unbalanced output, but if you need to add that you can probably add it off pin 3 of the XLR. Schematic for reference.

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25 comments:

  1. sinaiMay 29, 2019 at 12:07 PM

    Waht is active in and passive in and how to use this inputs if i have pedals befor this.
    Sorry for this question.

    ReplyDelete
  2. sinaiMay 31, 2019 at 7:35 AM

    ok tnks for reply.

    ReplyDelete
  3. SevrienJune 7, 2019 at 2:19 AM

    has someone tried this on 9V yet?

    ReplyDelete
  4. skizoideJuly 3, 2019 at 6:44 AM

    I made a modified layout based on this one, with a TL071 and a switch to choose between passive and active input (3k or 10k resistor), and works (maybe serves as verified?), but if I use the pin 3 of the XLR as unbalanced output, sounds a loud pop when I activate the box. I tried with different values of resistors to ground in the output, but with no luck. Anybody can help me with this?

    ReplyDelete
  5. Hugo C,July 5, 2019 at 4:53 PM

    Hi, the tranfer image is in the library? i cant find it. thanks!

    ReplyDelete
  6. NIABJuly 18, 2019 at 2:46 AM

    The DI at the Hartke LH1000 sounds really good , i hope any of you guys can make this proyect work! It would be great!

    ReplyDelete
  7. ShevelOctober 17, 2020 at 2:29 AM

    Is there a cab sim in it? Can i make a big pedal with a preamp in it with xlr and headset output?

    ReplyDelete
    Replies
    1. Effects LayoutsOctober 17, 2020 at 5:09 PM

      You'd need to add cab sim circuitry. This is just a DI.

      Delete
    2. Zaraki1337August 23, 2021 at 6:48 AM

      which cab wud suit this? what are ur recommendation?

      Delete
  8. ShevelOctober 18, 2020 at 1:27 PM

    Thanks you for your answer but i can't find a layout of a cab sim for bass. Do you have something about that?
    Can i use this layout http://effectslayouts.blogspot.com/2017/08/simple-cabsim.html?m=1 with other cap values? Double values i mean?

    ReplyDelete
    Replies
    1. Effects LayoutsOctober 18, 2020 at 8:37 PM

      Most schematics I've seen out there for cab sims are guitar specific. Though I'd suggest trying out the Run Off Groove Condor. It simulates a 4x10 cabinet. You can try messing with cap values, but I would try it stock first.

      Delete
  9. bassmanDecember 19, 2020 at 5:59 AM

    Hello. I would like to wire a ground lift switch to this circuit. Where do I connect the switch to make it work?

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  10. TalivanMarch 26, 2021 at 11:54 AM

    So if I already have a bass preamp, I must put another wire to the pcb output to the In on this layout?

    ReplyDelete
  11. AlamondmApril 24, 2021 at 5:08 PM

    Tag it. I built this one up. Works great. I did add an unbalanced out off of pin 3. This is a great sounding DI. Clean and the active / passive works great with my basses. Thanks for a great layout and site,
    Matt

    ReplyDelete
    Replies
    1. Effects LayoutsApril 27, 2021 at 4:26 PM

      Thanks for verifying!

      Delete
    2. Zaraki1337July 31, 2021 at 3:25 PM

      @alamondm how did u make un balance out?



      By connecting tip of 1/4 jack to xlr pin 3
      And sleeve to ground?

      Plz elaborate..

      Delete
  12. Zaraki1337August 23, 2021 at 6:50 AM

    is passive input suppose to work even if this DI isnt powered on??

    ReplyDelete
    Replies
    1. Effects LayoutsAugust 23, 2021 at 12:03 PM

      It needs power to work unless you've added a bypass switch.

      Delete
  13. Zaraki1337August 23, 2021 at 7:43 AM

    anyway i can add groundlift in this??

    ReplyDelete
    Replies
    1. Effects LayoutsAugust 23, 2021 at 12:06 PM

      Add an on/off switch between XLR lug 3 and the lug 3 pad.

      Delete