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Logitech G15 v2 LED mod voltage question!

post #1 of 6
Thread Starter 
Do you think if i found a few PLCC2 SMD orange LEDs at 2.1v its safe to assume OEM G15 rev2.0 orange LEDs also run at 2.1v? If so i want to order 2.1v red SMD leds then i can do the job without soldering tiny resistors everywhere like the aussy guy (link at bottom) did by using blue led's (3.1v + 82ohm smd resistors)

I only need 10 PLCC2 3528 SMD red LED's. http://search.digikey.com/scripts/Dk...-2%20red%20smd i got long list here with different wavelengths and voltages.

or i can get these guys --> http://www.ioffer.com/i/50pcs-plcc-2...40?source=eisi

You think its ok to go ahead and just put Red LEDS without new resistors?

http://forums.overclockers.com.au/sh...d.php?t=915965 <-- guide
Edited by 2JZ - 5/17/11 at 8:41pm
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post #2 of 6
You will need resistors otherwise your LEDs will burn out. Assuming the current draw is around 20mA, 150ohms should do.
post #3 of 6
Thread Starter 
Quote:
Originally Posted by krajee View Post
You will need resistors otherwise your LEDs will burn out. Assuming the current draw is around 20mA, 150ohms should do.
so is it dependent on the current draw not voltage? The blue LED mod required only 82ohm resistors, and blue LEDs are at 3.1v! The keyboard has resistors for the orange led and orange and red are very similar, if anything wouldn't red be easier to run? This way i can save tons of time and do half the soldering. From all the orange LED's i could find they all seem to over power the red ones in voltage and mA.
Edited by 2JZ - 5/18/11 at 10:30am
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post #4 of 6
Resistors limit current.

Anything on the G15 should be powered by 5V, which is what USB provides. I'll keep this simple and suggest you read about Kirchoff's Law if you want to know more - I'm not the best for explaining stuff. The blue LEDs have a forward voltage rating of 3.1V which means out of the 5Vinput, there's 1.9V "leftover". Assuming current draw is 20mA, and knowing that V = IR, we can derive R = V/I and put in R = 1.9/.02 which comes to 95 ohms. I would probably guesstimate that the current draw of the blue LEDs would be closer to 25mA though.
post #5 of 6
Ohm's law. Kirchoff just added some fancy equations to it.
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post #6 of 6
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Do the resistors on the keyboard signify their resistance in anyway? If all orange 3528 orange LED's are created equal, or close enough that resistors wont matter, i can save half the soldering, time and chance of bricking my keyboard. I figured since red LEDs are nearly the same thing as the stock orange i could get away without swapping resistors.

** also the keyboard already has 6 red LED's in its stock configuration, which is why i thought i could swap the orange leds with red leds and NOT change the resistors

I purchased all the materials and tools on ebay i will post up the results and some of the build to show how it comes out. Expect 1 month wait time for shipping and building
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