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Old 10-28-2007, 04:05 AM   #1
DrinkMore DrinkMore is offline
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Default Electrical HELP!!!
Got a problem that I can't wrap my brain around.

Problem - I have a Christmas tree that has 10 lights (battery powered). Regular clear lights. Not leds or anything. I converted it to USB powered. I plugged it in and all worked well.. for a while anyways.

The lights were unusually WHITER and BRIGHTER. I knew then that they were getting TOO MUCH power. So, one by one they blew out. Now it's dead.

The issue is - I don't know what resistor I need to prevent that from happening. Here is what I know thus far..

USB = 5v

Battery Powered Lights (10 lights) = 3v / 4watts

I need to go to rat shack tomorrow and get a resistor but I have no clue which one to get. Most all are in ohms.

Please help! Thanks!
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