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Boss DS-1 Keeley Mod

Discussion in 'Burnt Fingers DIY Effects' started by FosterF, Jun 15, 2012.

  1. FosterF

    FosterF Tele-Meister

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    I Just did the Keeley mod to my DS-1 and the LED I used for D5 is not lighting up when I play. What could cause this? I modded one about two years ago and it lit up perfectly fine.
     
  2. Phildog

    Phildog TDPRI Member

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    What value resistor did you use for the LED? Also, did you install the rresistor to the correct leg of the LED?
     
  3. FosterF

    FosterF Tele-Meister

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    It's not actually the indicator LED. It's an LED used as a clipping diode. D5
     
  4. cousinpaul

    cousinpaul Friend of Leo's

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    Is the LED oriented properly? Try reversing the connections to it's legs. They only conduct in one direction.
     
  5. FosterF

    FosterF Tele-Meister

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    Yep it's the orrery direction! negative to negative and positive to positive. The pedal even works and sounds good! just no light..
     
  6. gshep92

    gshep92 Tele-Meister

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    How would one go about doing this mod exactly?
     
  7. FosterF

    FosterF Tele-Meister

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    It's what Brian Wampler posted in his book as Robert Keeley's DS-1 mod:

    C1 - .1uf
    C2 - 1uf
    C5 - .1uf
    C7 - 220pf
    C8 - 1uf
    C9 - 1uf
    C12 - .1uf
    C14 - 1uf
    R14 - 1.5K (I did 10K so as to lower the gain)
    R35 - 2.4K
    R39 - 20K
    D4 - LED
    D5 - LED and 47pf cap in series


    R14 is 2.2K stock. If you lower it to 1.5K it will raise the amount of distortion. I chose to raise it to 10K so as to lower the distortion.
     
  8. cousinpaul

    cousinpaul Friend of Leo's

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    OK, try taking R14 back down to 1k5 or 2k2 and see if it lights up. Then you can raise R9 a bit to lower the gain. 100 ohm works well for me. Try 47 ohm if that's too big a cut.
     
  9. FosterF

    FosterF Tele-Meister

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    Awesome! I'll give it a try. Thank ya!
     
  10. tukk04

    tukk04 Tele-Meister

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    if the LED you're talking about is setup as a clipping diode chances are it's not going to light up. Diodes generally don't light up when used for clipping and whether it does or doesn't if it works what does it matter.
     
  11. czech-one-2

    czech-one-2 Friend of Leo's

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    ^ Thats true....unless you drill a hole in your Boss pedal specifically to see your clipping led light up.:eek:
    While that was pretty mind blowing 15 years ago:rolleyes: I think the novelty has run its course.:lol:
    Just teasing, to each his own!
     
  12. DADGAD

    DADGAD Friend of Leo's

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    That's why your LED won't light. :lol:
     
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