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Controlling common negative LED string

Discussion in 'Lights - Store Bought and Home Made' started by Nuzzy, Dec 22, 2017.

  1. Nuzzy

    Nuzzy New Elf

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    Hi Guys,

    I have one string of lights which has a common negative, how would I go about controlling these with Alan's DC30 board? All the other light strings are common positive so easy to control but how to reverse this one is stumping me at this time of night.

    Thanks.
     
  2. David_AVD

    David_AVD Bite my shiny metal ass! Community Project Designer Generous Elf

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    That's very unusual to have a set of lights with a common negative.

    You could use some PNP transistors to do the "high side" switching like this:

    [​IMG]
     

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