i'm trying to wire 2 blue 5mm leds for a mod, i'm soldering them in a parallel so i dont have to use any resistors this is how i'm doing it... 5v, +, -, +, -, ground each led should be lighting up because they both should be getting 2.5 volts but their not liting up! help?
the leds are still working? use a battery to test them, i use the ones that motherboards use it is really easy to test them with that kind of batteries
if you wire them in parallel they both get 5V so you prolly fried the LEDs already you have to wire them in series to make them get 2.5V each and not use resistors but 2.5V is low for blue LEDs, usually 3.8-4V
Also, you should ALWAYS use a current limiting resistor if the supply will fluctuate, regardless of the forward voltage drop. LEDs are non-ohmic and will draw much more current if they receive a higher voltage than they are rated for (= bad!). Wire them up in parallel (not series as how you described you did) and put on a current limiting resistor. -special [k]
this is what i'm doing why wont it work i'm doing what you guys say and i have read guides on the internet and i'm pretty sure its all right and yes the leds do work?
As the stoned penguin has said, 2.5V is too low for blue leds. They need about 3.6V each. So follow specialk's advice...
