Will 12 V hurt pedals made for 9 V?

Discussion in 'The Stomp Box' started by nosuch, Nov 4, 2018.

  1. nosuch

    nosuch Friend of Leo's

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    Accidentally I plugged the 12 V power supply that came with my fly rig into the tremolo pedal that uses 9 V. It worked so I tried a daisy chain with my Cry Baby. I didn't dare to plug it into the digital ditto looper I have.

    Will the 33 % more voltage hurt the pedals?
     
  2. RoyalBaby

    RoyalBaby Tele-Afflicted

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    Yes.
     
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  3. nosuch

    nosuch Friend of Leo's

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    Thanks, so I'll better use the 9 V supply for the other pedals.
     
  4. fjrabon

    fjrabon Tele-Holic

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    It depends. But it definitely could.
     
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  5. trouserpress

    trouserpress Tele-Holic

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    a little more than 30% above can be too much esp. for transistors.
     
  6. fjrabon

    fjrabon Tele-Holic

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    Yeah, it really just depends on how conservative the company is and the topology of the circuit.

    Some pedals are “designed for” 9V, as in they’re tonally tuned for 9V, and sound weird/thin/sterile on higher voltages, but will “work” fine at higher voltages without anything dying.

    Some will die if you go much over 10.5.

    And some have power management and internally convert the voltage anyway to whatever voltage it needs, so it doesn’t matter as long as you’re above that. Some digital pedals really only run on like 4V, so anything you connect it to gets converted inside the pedal to 4V, regardless of if you’re giving if 18V or 5V.
     
  7. nosuch

    nosuch Friend of Leo's

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    Peculiarly my old Cry Baby sounded "better" to me with the 12 V supply. Cleaner and with more headroom. But I don't want to fry it – it has been with me for so long.
     
  8. trouserpress

    trouserpress Tele-Holic

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    I would a/b the Cry Baby a couple more times and if I still could hear the difference at 12V i'd go for it. And if it went kaputt I'd try to swap the broken parts for more robust ones and would probably do some more overhauling. No risk no fun! Better is the enemy of good!

    Hope you won't regret it in case you listened to this.o_O
     
  9. luckett

    luckett Banned

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    Bad advice.

    Good Advice.

    Bad advice. Most transistors used in pedals can easily handle 12V. Electrolytic capacitors are the most common component you need to be careful with.
     
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  10. dsutton24

    dsutton24 Doctor of Teleocity Ad Free Member

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    Bad advice.

    The voltage that a transistor can 'handle' is one criteria that's used when choosing a transistor. Just as important is how the transistor is used in the circuit, how it's biased, and what kind and amplitude the signal is that the transistor is handling. Those things can be impacted by supply voltage.
     
  11. luckett

    luckett Banned

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    None of these criteria are relevant to determining if a transistor can handle a 12V supply voltage.
     
  12. telemnemonics

    telemnemonics Doctor of Teleocity Ad Free Member

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    Many pedals have voltage doublers that fry if given more than 9v, not sure if 12 kills them but 18v does.
    Some chips also can’t handle more voltage.
     
  13. dsutton24

    dsutton24 Doctor of Teleocity Ad Free Member

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    Wrong. You can destroy a transistor that is well within its voltage ratings by running it outside its power handling curve. Pedals, amps, whatever are a collection of components that all effect the signal going to a transistor.
     
  14. luckett

    luckett Banned

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    Anything will blow if you force enough current thru it. Your odd responses are still not germane to the low current operation of a transistor in a pedal at 12V supply voltage.
     
  15. RLee77

    RLee77 Friend of Leo's

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    It’s a pedal-specific question, not a ‘yes or no’ question covering all pedals. The detailed specs of some pedals will give a range.
    If I had to generalize, I would say *most* pedals will be fine on 12v. Especially analog pedals. Digital pedals will likely have a regulator circuit, so they would be fine, but the regulator would run hotter.
    From a design aspect, a pedal that runs on 9v and fails at 12v would be a rather poor design. I’d be somewhat surprised (and disappointed) to see that.
     
    Last edited: Nov 5, 2018
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  16. fendrguitplayr

    fendrguitplayr Poster Extraordinaire

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    You should never over-volt. You can use a higher current, because it'll only draw what it needs, but the voltage you need to be careful on.

    Check the product documentation. Even if it can handle more without exploding, being constantly powered by a higher voltage than what it's made for isn't going to do a pedal, or any other piece of equipment, any good.
     
  17. dsutton24

    dsutton24 Doctor of Teleocity Ad Free Member

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    Give it up, you are scrambling.
     
  18. luckett

    luckett Banned

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    I'll still be here if you've got any more nonsense you would like to elucidate upon.
     
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  19. Tonetele

    Tonetele Poster Extraordinaire

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    Yes. Without getting technical the circuit of ANYTHING electrical must end in zero.
    Too tired to talk about Kirchhoff's Law so ask via conversation channel if you want.
    I think you have enough good advice already.
     
  20. Zeonoid

    Zeonoid Tele-Holic

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    ..and it can deffinatelly fry some of your stomp boxes as I fried my MXR Dynacomp with 12Volts !
     
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