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Thread: Could I have fried a bunch of my LEDs?

  1. #1
    chriswf's Avatar
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    Could I have fried a bunch of my LEDs?

    I thought hey, why don't I use a 9v battery to test my LEDs, because basically EVERYONE has mentioned bad LEDs no matter who you buy them from it seems.

    So I tried searching on here. No one mentions how they test them.
    So I figure, 9v battery for a smoke detector, direct current, should work.

    Plugged it up to 1 LED and it flashed. Then the LED wouldn't turn on again.

    Okay...

    So I soldered a chain of LEDs together, like 6 or so.
    Hooked them up to my driver (the 35-700 from Rapid LED).
    They all flashed once, then turned off and won't light back up.

    What's the problem?
    Do I need a resistor or something?

  2. #2
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    I would guess you fried it with a 9v battery. But if they flashed with the driver, that is a good sign. You need at least 8 LEDs in a row to test them with that driver, anything less and they won't work. To test individual LEDs you need 2 AA batteries (3v), not 3x that power (9v).

    http://www.rapidled.com/aa-battery-led-tester/

  3. #3
    chriswf's Avatar
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    Well... What about when I plugged them up to the actual driver and they fried?

  4. #4
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    The driver has built in protection, if there is too little or too many LEDs it won't fire up (just flash).

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    http://www.meanwell.com/search/LPC-35/default.htm

    9v minimum output, so 6 LEDs should have worked fine if their Vf was 2V.

    I think you blew them up by testing with a 9v battery.

  6. #6
    chriswf's Avatar
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    Fixed it
    I did blow a few reds. My scrubber is built, pics incoming soon.

  7. #7
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    http://algaescrubber.net/forums/show...9010#post29010
    There's my somewhat finished product in action.

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