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Tuesday, December 4, 2018

Mini BassDrive

This is an adaption of the Fulltone Bassdrive without the boost footswitch, allowing for a smaller enclosure. I got the idea from a comment by Simão on the Fulldrive 2 post, and I though it could prove useful for my fellow bassists. Like the Fulldrive/Bassdrive, it's modded Tube Screamer with clipping and voicing options with the 2 toggle switches. Based on this schematic with the boost footswitch and 2nd gain pot removed.

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15 comments:

  1. andresguevaraDecember 4, 2018 at 12:45 PM

    Best regards, the file is found in the Misc folder???, thanks and success.

    ReplyDelete
  2. ernestoDecember 10, 2018 at 2:39 AM

    I think the are some mistake on the layout: Q4 gate and drain must be conected to 1n34a anode and the gain POT is backwards

    ReplyDelete
    Replies
    1. Marcus CorradiniDecember 24, 2018 at 6:06 PM

      Marvin, you're right about Q4. The position of the gain pot is irrelevant, as long as the resistance is between lug 1 and 2.

      Delete
  3. SimãoDecember 13, 2018 at 12:21 AM

    Been out lately and now I see this! Gotta give it a go. Thank you sir.

    ReplyDelete
  4. UnknownDecember 15, 2018 at 8:18 AM

    is this verified yet?

    ReplyDelete
  5. johnkDecember 22, 2018 at 11:23 PM

    it's verified with the exception of the Comp/FM/Vintage(FCV) switch. the Comp and FM modes work perfectly, but the vintage mode does nothing (it sounds exactly like the FM mode). as far as the comment about the gain/drive pot being wired backwards, i tried it both ways and it works exactly the same, so the layout is fine in that respect.

    ReplyDelete
  6. johnkDecember 27, 2018 at 3:29 PM

    FIXED IT! i ended up reversing the lugs on the drive pot and connecting to 10n cap to drive 2.
    here's a modified layout with the corrections: http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BassDrive/MiniBass-D/01-Mini_Bass_Drive_Layout-FINAL.png

    and here's the PCB for it: http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BassDrive/MiniBass-D/Mini_Bass_drive_PCB.jpg

    ReplyDelete
  7. johnkDecember 27, 2018 at 5:08 PM

    and here's the schematic: http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BassDrive/MiniBass-D/Bassdrive_Mini.jpg

    ReplyDelete
    Replies
    1. Effects LayoutsDecember 29, 2018 at 12:16 PM

      Thanks for working this out, John. I'm fixing my layout currently.

      Delete
  8. johnkDecember 27, 2018 at 8:14 PM

    one more layout that requires less modification to storyboardist's one: http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BassDrive/MiniBass-D/001-Mini_BassDrive_Layout.png

    ReplyDelete
    Replies
    1. Effects LayoutsDecember 29, 2018 at 12:15 PM

      I think this has got some issues. The 22k resistors that should set the minimum setting of the gain pot is only going to CFV lug 4, and the 10n and 47k components are coming off pin 2 of the IC instead of after the 22k resistor. If anyone is using John's layout stick with the first one.

      Delete
  9. johnkDecember 27, 2018 at 8:18 PM

    and here's my completed pedal: http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BassDrive/MiniBass-D/MiniBass-D-01.jpg

    ReplyDelete
  10. TrevorJune 23, 2021 at 9:18 PM

    Verified

    ReplyDelete