running cold cathode (or something similar) off of USB power

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  1. 06-10-2003, 11:42 AM #1
    retrofade
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    running cold cathode (or something similar) off of USB power

    I'm working on a project which would require me to run a cold cathode light off of USB power. Doesn't matter what cathode is used...just has to be under 10" in length.

    Thanks in advance for any suggestions you may have

    -retro
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  2. 06-10-2003, 12:47 PM #2
    natgun
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    http://www.newegg.com/app/viewproduc...ion=antec+tube


    there are a few more kinds not listed there, i got a single multi-color tube myself, your welcome.
    Last edited by natgun; 06-10-2003 at 12:49 PM.
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  3. 06-10-2003, 12:55 PM #3
    retrofade
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    those might work...unfortunately, what I need to do is to borrow the power from an existing USB device, like a keyboard or mouse. Any suggestions on that?
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  4. 06-10-2003, 01:49 PM #4
    Mrfreddio55
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    Heh, well I will tell you that USB can only pump out 5v. And most all of the cathodes you'll see will be running on 12v current.

    just a fyi

    Dont quote me on this, but the cathode may light up through usb power, but just wont be nearly as bright as when connected to a power supply.
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  6. 06-10-2003, 02:06 PM #5
    retrofade
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    Originally posted by Mrfreddio55
    Heh, well I will tell you that USB can only pump out 5v. And most all of the cathodes you'll see will be running on 12v current.

    just a fyi

    Dont quote me on this, but the cathode may light up through usb power, but just wont be nearly as bright as when connected to a power supply.
    yeah, I discovered that...

    Does anyone know the brightness difference between a cold cathode and those LED lights that natgun linked to?
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  7. 06-10-2003, 03:26 PM #6
    Mrfreddio55
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    Originally posted by retrofade

    yeah, I discovered that...

    Does anyone know the brightness difference between a cold cathode and those LED lights that natgun linked to?
    I would doubt that the LED lights are as bright as the cathodes, but im not sure on the difference..
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  8. 06-10-2003, 03:46 PM #7
    muisejt
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    Originally posted by retrofade

    yeah, I discovered that...

    Does anyone know the brightness difference between a cold cathode and those LED lights that natgun linked to?
    read the reviews that Newegg linked to, like this one it even has a pictures comparing the two
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  9. 06-10-2003, 03:51 PM #8
    natgun
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    not quite as bright, but it uses usb... ill let you know what its like when i get mine. although im gonna use it to light up my keyboards under my hutch.
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  11. 06-10-2003, 04:36 PM #9
    tu2thepoo
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    how much current can USB deliver?

    i want to run a lantern/torch flashlight off my usb ports.
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  12. 06-10-2003, 04:54 PM #10
    muisejt
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    500mA is the max
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  13. 06-10-2003, 05:09 PM #11
    tu2thepoo
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    is that enough to light my way to Tuskenooga?
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  14. 06-10-2003, 07:24 PM #12
    retrofade
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    any other thoughts?

    (bump)
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