Home Forums Help/Technical Questions Power Supply Question

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  • #78488

    hi all

    I have a flanger hoax pedal without a power adapter. I have an old laptop power supply which is 18v @ 1.6amps. I also have a dunlop univibe without a power adapter.

    Flanger Hoax – 18 volts 500ma
    Univibe – 18 volts 150ma

    my adapter – 18volts 1.6amps.

    Now here’s the Electrical engineering question I can’t answer. Can I use said adapter in a daisy chain configuration and will the extra amperage be irrelevant.

    ie —-18volts@1.6amps—(+)


    | |
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    Univibe Flanger Hoax
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    | |


    (-)



    Problems I see with this:

    1) V=IR and 1500ma + 1150ma will not equal 1 1.6 x 10^3ma

    2) assuming the pedals draw only what they need current wise : how will the resistance of the pedals influence things? Or is it the resistance of the peadals that determines the draw of current?

    3) I think that a laptop operates at a pretty small current most of the time, and more when charging a battery etc. So I think it is pretty reasonable to assume that the laptop power supply has a fairly stable voltage output when the current varies.

    4) I ONLY HALF KNOW THIS STUFF! And its something I would like to learn. but at the moment i would just like to get my pedals working with the adapter I have.

    Flanger Hoax manual has a hard-core statment like “use the adpater that comes in the box or prepare for interspatial wormholes”.. .. …. I find it hard to image the Flanger Hoax using 500ma -unless its incredible sound IS actually made through opening interspatial wormholes.. heeeheee

    ( BTW: FLANGER HOAX SOUNDS INCREDIBLE) (UNBELIEVABLEY INCREDIBLE!)

    So if anyone could help me out it would be cool. Statements like – go buy two power adapters- aren’t what i’m after. even if it is the option that makes most sense.

    I also have a question about grounding of pedals negativepositive grounding and how that effects…well…err…um.. my effects ;)

    First post so go easy.

    EHx – u make delicious effects.like willy wonka delicious.

    Chris

    #98405
    julian
    Moderator

    The important thing here is polarity- the adapter, the univibe, and the flanger hoax all need to be the same polarity. If so, I think using your standard pedal daisy chain would be perfectly fine.

    As for voltage, the voltage in a parallel circuit is constant. The variable is the current. Which is fine.

    See here: http://en.wikipedia.org/wiki/Series_and_parallel_circuits#Parallel_circuits

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