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power question

Discussion in 'Power Supplies' started by Porsche, Feb 24, 2013.

  1. Porsche

    Porsche Full Time Elf

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    This is probably a very dumb question,
    I have just made a 20 Channel pole with dumb white LEDs. Was testing them today from a DC48 board.
    I checked the power going into the board at exactly 12v and then checked the output on the LEDs and came up with about 10V.
    Then when I turned the volts up a bit to 13V going in to the board, the leds got brighter but I checked the volts with the multimeter on the terminal outputs and came up with 8v.
    so why is it that when I turn the volts up to the board, the output to the Leds actually goes down but the lights get brighter.
    can anyone shed some light on why this would happen and if its normal.
    Cheers
     
  2. David_AVD

    David_AVD Bite my shiny metal ass!

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    My guess is that your meter (cheap one?) is not reading the output voltage correctly due to the PWM waveform.
     

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