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Little Led Question


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#1 fire2501

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Posted 13 May 2004 - 01:50 PM

i bought 100 blue and 100 red leds off of ebay.. i dont know what voltage they are or anything.. i suck at math and i dont understand those calculators for the resistor calculation.. how many leds would i have to wire up so i wouldn't need a resistor?? if im running off the hardrive power (like solder into the same wire) or do you always need a resistor?? i would like to do all the controller ports and everything except i really dont understand the resistor part of things.. and the calculations... if theres a strategy or something to it that makes it easier to figure out then please tell! lol wink.gif

#2 bucko

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Posted 13 May 2004 - 02:59 PM

I can't really help as I never done this stuff before, but hum should you know your stuff before your start modding?

#3 Pullout Method

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Posted 13 May 2004 - 03:38 PM

Depends on the quality of the LED. If it's really dim, it's trash. throw all 200 away, go buy some 100ohm 2000mcd LEDs and start over again.

Lots of sites have LED calculators on them, we just need to know stats before we can tell you what resistors you need.

#4 dank42

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Posted 13 May 2004 - 03:51 PM

ut leds are probably 3 or 3.5 volts ,20 ma
and it depends on what wire u use on the molex splitter either yellow-7volt or red-5volt
most peeps use the red wire
and if ur plannin on runnin a lot of leds u prob just need to get some 10-15 ohm resistors and run strings of 7 leds and using only one resistor (assumin ur usin the red wire and the leds are between 3 and 3.5 volts, most are)
ph34r.gif

#5 NatasCub

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Posted 13 May 2004 - 04:19 PM

QUOTE (dank42 @ May 13 2004, 01:51 PM)
and it depends on what wire u use on the molex splitter either yellow-7volt or red-5volt

Yellow wire on a standard molex is 12v not 7v. But it's a moot point as it's best as you said to use the red 5v line. If anyone needs one, I've laid out an excel spreadsheet to do my resistor calculations. I've got seperate worksheets for single, parallel, and series. Zipped up it's about 6 or 7k. Drop me a pm with your e-mail and I can send it to you.

#6 fire2501

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Posted 13 May 2004 - 10:30 PM

wink.gif so there is no way to wire up some leds so you dont even need a resistor??... wink.gif cuz i dont want to wait forever to order resistors in.. because i cant buy them anywere local... best i got is radioshack for resistors..

#7 NatasCub

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Posted 14 May 2004 - 12:06 AM

Here's a link to that resistor spreadsheet I mentioned above.

LED Resistor Calculator

#8 fire2501

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Posted 14 May 2004 - 12:15 AM

so does that mean if i wanted to hook one 3.5v led up to the 5 volt power cable i would need a 50 ohm resister?? and it wouldn't blow or anything?? thnx alot for the help..

#9 NatasCub

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Posted 14 May 2004 - 12:38 AM

If you want to feed it 30 mA, yes.

#10 fire2501

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Posted 14 May 2004 - 01:05 AM

whats the mA? cuz my leds dont have any information at all on them other then the fact that they are 6000 mcd and they are 3mm?

#11 NatasCub

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Posted 14 May 2004 - 01:49 AM

mA is milliamps. The number represents how much current your led can draw.

#12 fire2501

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Posted 14 May 2004 - 02:10 AM

yea i dont know how much the led is it didn't say...??? how can i find out?? also is there ANY way of not using a resistor? like wireing up a certain amount of leds to equal the same voltage or something??




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