And i don't know where the hell to start.

Any suggestions?


btw they seem to be stable running with 5v...i've got a pair of them that's been goin for over 30 minutes now and they're not too hot or anything...=/ do i still have to put a resistor...cause that'll be such a pain >_< because:

a) i don't even know what i need
b) i don't even know how many resistors that would be >_<
c) it'd be a lot more work

do you have any specs for the forward voltage drop for the leds? might be stated as a nominal operating voltage... blue leds tend to have a drop between 2.5 and 4v, and you really should have a resistor in there if you are running them directly off the rails

led resistor calculator.. someone posted a very good link to one that even did parallel resistance calculation in your original thread...

yea foward is 3.2-3.6.

and NRG i'm still not sure what to plug in for that...hehe

but these two have still been goin for almost an hour and they're not hot at all...heh
[edit] nah this won't work they're already starting to dim =(

so for the VOLTAGE drop on the calc i would type in 3.5 or so? i don't have much understanding of electronics like this.....anywho, one thing i'm confused about is why it matters how many leds are connected in the parallel version...because afaik it shouldn't, from what i know about types of circuits.

i usually go for the easy way
Plug them on 12V and to each a 470 Ohm resistor on the + leg

sounds easy enough, thanks kobalt =)

They should glow brighter at the stated operating voltage too...

thanks kobalt, i will be using this too as ive ordered 100 leds too :|

oooh wait kobalt is that for 12v down to ~3.5v?

here are some of them hooked up to my 3.3v rail on a spare psu i had heh

I dont know what you mean but looking at your pic, i think you've got it

I use the straight 12V wire (yellow for most PSU) when the 470 Ohm is on, and the minus leg on a negative wire. The guy at my electronics shop told me that they might last a bit less with that res. but since a led is rated at 10,00 hours, what's a couple of hundred hours less