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pedal construction/wiring question

Discussion in 'Effects, Pedals, Strings & Things' started by ezcomes, May 16, 2011.

  1. ezcomes

    ezcomes Member

    Messages:
    1,198
    Joined:
    Feb 18, 2009
    the huminator
    http://www.beavisaudio.com/Projects/Huminator/index.htm

    was looking to build this for my one spot...but...was wondering...i tried emailing the guy, no response...

    if 9V are going into the system...using the 100ohm resistor, shouldn't the resistor be a 1W not 1/2W?

    P=I x E = (E/R) x E
    With 9 volts coming in via a one spot, and then through a 100ohm resistor, P=(9/100) x 9 = 0.81W
     
  2. stinkfoot

    stinkfoot Member

    Messages:
    6,144
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    Jun 20, 2004
    Location:
    Uppsala, Sweden
    It'll work just fine. The current flow is decided by the pedal(s), so the actual "heat" that resistor will see is not that much.

    Whether or not it will actually make a difference with a 1spot is a different matter, though. That circuit is designed to filter out low frequency hum (120Hz ripple left over by the rectification process in the adapter), but switching adapters like the 1spot have their ripple shifted to a much higher frequency range. If you have a problem with the 1spot now, it's more likely to be a ground loop or pedal interaction issue.
     
  3. ezcomes

    ezcomes Member

    Messages:
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    Feb 18, 2009
    so...if i had a ground loop issue, introducing a bit of hum...if this build wouldn't do it, how could i fix this?
     
  4. dlab

    dlab Member

    Messages:
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    Feb 15, 2010
    Location:
    ATL
    Say you have hum in your rig. If it comes and goes, it's most likely the electrical wiring where you're playing. In that case, I don't know that there's much that you can do short of upgrading to an isolated and regulated supply :-(
     

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