QUOTE(m.browning @ May 6 2012, 02:01 AM)
I am new to led modding, and i do not understand how you can power a 3.5V led (such as a white one) when there is only 3V coming from the 2AA pack. Can someone please explain to me how this is possible?
I don't understand how people can have so many LED's on a wireless controller when it only puts out 3V.
2 x AA batteries don't output 3v, it's closer to 3.4v or so when they're both new, but that drops to 2.2v over the useful life of the battery, as far as the controller is concerned. That's only considering Alkaline batteries also as the PnC pack is around 2.7v and drops to around 2.2v or so.
A lot of LEDs will work on a little bit lower voltage than what they are rated at, and not all White LEDs need 3.5v to work.
It also depends on who's controller it is. They could have added in a DC-DC Boost regulator or LED driver to step up the voltage and drive them, or they could simply just be working on the lower voltage the controller outputs.
QUOTE(psphackr @ May 6 2012, 09:18 AM)
When it comes to electronics you don't have to always be exact as far as the voltage goes.
Yes, you do.
For instance, I do some electrical work on cars. I put a new radio in mine a few months back. Since the radio is meant for a car's electrical system, it's of course rated for 12 volts DC. However when I put a volt meter on my car battery it usually only reads out at about 11 or 11.50 volts.
Either your battery is going bad, or the one in your meter is, because that's not correct for a good 12v car battery, and if you found that voltage difference odd, start the car up and check it again.
Electronics made to work in vehicles use Regulators to step the voltage down and keep it at 12v or lower, depending on what the electronics need to work, and even those parts of a car stereo that say 12v will still run off a volt or less with no really noticeable difference as that higher voltage is used for the Amplifier section in the head unit, whereas the main bits of it will run off of 5v or less, but it's there.
Likewise, larger outboard Amplifiers use PWM and DC-DC to step up voltages for driving larger speakers.
LEDs on the other hand are current driven devices, and if there isn't enough voltage to 'turn the LED on', there isn't going to be enough current for it to work at all, and that margin for working/not working is much smaller than the head unit for a vehicle.
Just make sure you don't put a ton of lights in it or you'll put too much amperage on it and ruin your controller. Idk what the amperage rating is for the controllers but it's probably not that much.
Pulling too much current form the controller will just cause the batteries to heat up and possible melt or catch something on fire, the same as with any battery, but you have to pretty much dead short it for that to happen. The 'average' LEDs aren't going to cause ay issue like that as they typically pull around 20mA or less each, so you'd need to have more than a few of them in there to even tank the charge in the battery quickly.This post has been edited by RDC: May 6 2012, 05:24 PM