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Thread: Getting 5V out of a laptop using USB

  1. #1
    Join Date
    Sep 2004

    Getting 5V out of a laptop using USB

    I want to power an alphanumeric LCD backlight; I'm pretty sure it draws too much power to use the parallel port but I'm guessing it'll be fine with the USB port, which should give at least 500 mA, right?

    For some reason I'm terrible at reading specs, but according to this:
    the backlight only draws about 300 mA. Is that a realistic number, or am I reading it wrong? If it's realistic, should powering it via USB be a piece of cake?

    edit: got the current wrong, it should be accurate now

  2. #2
    Variable Bitrate
    Join Date
    Apr 2004
    You should be plenty fine. Looks like under typical conditions it draw 20ma with white light and 110ma with yellow.

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