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Where to put fuse and what size to use for pixel tree

Discussion in 'Power Supplies' started by bovonic, Jan 3, 2014.

  1. bovonic

    bovonic New Elf

    Dec 28, 2011
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    Hi All
    I'm setting up a small display and want people's advice on where to put fuses - and what size to use.

    My display will be made up as follows

    250W PC power supply (contains a 6.3A fuse)
    -> 3 x ~1M power leads at 12V
    -> UBEC to convert 12V to 5V -> 48 x WS2811 pixels
    -> 1 x 1M power lead at 12V
    -> Teensy 3 microcontroller
    -> 3 x data cables connecting to WS2811s

    I'm using a PC supply as that's what I have handy, and UBECs (rated at 5V 5A though max draw for 48 pixels should be 2.88A) to convert the 12V to 5V to ensure a stable 5V supply (I've read the voltage on the 5V line can fluctuate and kill your pixels so this seems the safest bet)

    This is going on my in the house tree so I want it as safe as possible. All equipment will be in containers of some sort so fingers cant touch connections they shouldn't.

    Any help appreciated!
  2. ԆцряєсϮ

    ԆцряєсϮ Senior Elf

    Dec 24, 2011
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    Botanic Ridge
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    Your fuses are there to protect your cables so if your using 1.5mm2 cable a 10A fuse on the feed from the Power Supply to your UBEC's would be more than enough protection for that cable.
    If you wanted to protect your pixel cabling as I doubt that would be 1.5mm2 you could put a 5A fuse on each 5V lines.
    That would minimise any magic smoke should a fault occur.

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