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AC-DC mA adapter changes

Discussion in 'General Electronics Discussion' started by tedstruk, Feb 13, 2012.

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  1. tedstruk


    Jan 7, 2012
    Do I need to create a special circuit to adapt a 200ma output to a 30ma input...
    And can I use an adapter with a positive ground plug spliced backward to make it a negative ground feed line?

    I have a 200ma adapter with > positive + ---o )--- - negativeI need a 30ma adapter with > negative - ---o )--- + positive
    Is a 350ma adapter to large for my delicate roland tr-505 drumachine that uses a
    PSA-120 that has 9v 30mA on the case?
    I have a negative ground 9v 350ma, if I can't use the positive ground.

    The adapter that came with the device, doesn't have the voltage or amps on it, maybe the boss psa-120s and 120t are the right ones, and I should just buy a new one?

    (the new psa-120 comes with T and S options, and are of a higher milliamperage, and this worries me... I don't want to ruin my roland)
  2. BobK


    Jan 5, 2010
    When matching a power supply to a device, the voltage must match, the current must be equal or higher than the device requires. A device will not take more current just because a supply will provide it. So there is no problem in using a 9V 300ma supply in place of a 9V 30ma supply. Do swap the + and - leads so they are correct though!

  3. tedstruk


    Jan 7, 2012
    Thanks alot! I have forgotten most of my electronics from highschool!
    I will try it!
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