This is a discussion on Re: Wiring LEDs - Linux ; RickMerrill, ye ill-begotten wayward boy, despised substance of divinest show, ye threw up: > Kadaitcha Man wrote: >> Ming the Murphyless, ye freakish peevish baggage, here comes those I >> have done good to against my will, ye modulated: >> ...
RickMerrill, ye ill-begotten wayward boy, despised substance of divinest
show, ye threw up:
> Kadaitcha Man wrote:
>> Ming the Murphyless, ye freakish peevish baggage, here comes those I
>> have done good to against my will, ye modulated:
>>> wisdomkiller & pain wrote:
>>>> Ming the Murphyless wrote:
>>>>> I need to wire four white LEDs to run off a 12v dc supply (regulated).
>>>>> The Vf is 3.2-3.6 The calculation gives a resistor value of 220 ohms
>>>>> 2 LEDs in series. Can I wire all four in series without using a
>>>>> resistor or are there good reasons for having it? The LEDS will be
>>>> With 4 leds in series and exactly 12V, you will not see a very bright
>>>> light - evern without a resistor.
>>>> But, when you turn on the car engine and the voltage rises to 14.2 v or
>>>> you will first see a bright light, then a bad smell. In the end it will
>>>> dark again but you are a bit wiser
>>> ??? What car engine would that be then ???
>>> Seriously, what I'm trying to do is to illuminate a small box, roughly a
>>> cubic foot or so, from a regulated 12v mains adapter. I have a bunch of
>>> 5mm white LEDs for the job so I need to find the most efficient way of
>>> doing it. The box has been lit this way for a few years using 4 white
>>> LEDs which were designed to run on 12v each. The light from them has
>>> faded considerably so they need replacing.
>> The resistor limits the current flowing through the LED.
No ****ing ****?
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