[http://Guitar hero led mod https://www.instructables.com/id/Guitar-Hero-LED-Mod/]
For this project and i need some help quickly so...My questions are: Does this require any resistors with a 9v battery?
Wil it work fine with the regular buttons drilled out(I mean, will it shine through)? And is my wiring(below) correct (the step was kind of confusing)?


Picture of GH LED MOD
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drummer ian9 years ago
User V=IR
V = voltage in
I = current (this should be dependant on the LED, usually a couple of mA)
R = the resistor value you use
Soo... R = V/I
Butt we usually assume you loose 2v accross and LED so for you i expect it would be:
R = 9-2/(2x10-3)
Just remember to wire the leds in the correct ways round or they wont work (usually + is the longer pin)
my brain just exploded
Well, clean it up, then! And don't leave any little bits of brain gooping up the forums. Your mother doesn't work here :-)
How do you know that?
Heh. Technically, I was being rhetorical (it's a semantic construction which is supposed to be taught in school). However, unless your mother is one of exactly two people in the world, my statement is correct.
I think he was technically being humorous (it's a social construction which is supposed to be taught in interactions with other humans). :-P And more than two people work at instructables...
Humans? What are these "humans" to which you refer? I thought we were all digital constructs interacting via sophisticated pattern analysis software.

But only two females are staff; I'm excluding the intern on the basis of age.
Most LEDs also have a flat spot in the plastic lens indicating the cathode (in this case negative) side.
gmoon8 years ago
Use an LED calculator.
--The forward voltage (drop) depends on the LED type. Red LEDs have ~1.8V drop, other colors are somewhat higher.
-- Current is 20mA max for typical LEDs. 15mA is a safe level.

LEDs are current dependent--since the number of lit LEDs will vary, you must use a separate resistor for each LED. And each resistor / LED combo must be connected directly to the battery (not in series.)

Sure wish Instructables had an organizational structure so this question isn't asked 10 times a week...even something like "sticky faqs" would work...