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Circuit For Leds "please Help"


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#1 autogeek

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Posted 14 August 2007 - 04:46 AM

can anyone help me figure out a way to hook 3 bright LEDS in my car with the 12v output of the cigarette lighter?
can anyone help me with a simple diagram of how to do it?

#2 petez69

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Posted 14 August 2007 - 05:28 AM

QUOTE(autogeek @ Aug 14 2007, 05:22 AM) View Post

can anyone help me figure out a way to hook 3 bright LEDS in my car with the 12v output of the cigarette lighter?
can anyone help me with a simple diagram of how to do it?


OK, you need to use OHMS law. Voltage/Current = resistance...

So the led will need around 10ma of current and have a voltage drop of 0.7V. You will need to check the current the led requires, the bright white ones may need more....

SO... the maths is:

12-0.7 = 11.3V
10ma of current

11.3/0.01 = 1130 ohm

so I suspect round that down to a 1K resistor. Depending on the brightness of the LED, I've seen them driven from 680 ohm to 1K.

To wire it up, one side of the resistor goes to the +12V terminal. The other side of the resistor goes to the LONG leg of the LED.. the short leg of the LED goes to the ground terminal ie: chasis etc....

If you want 3, replicate this 3 times....

Cheers..Pete

#3 StrictPuppet

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Posted 14 August 2007 - 07:36 AM

Firstly, you already asked this question 2 topics down, no need to remake the topic.
Secondly, multiple accounts are not allowed on x-s. You should have just waited out your mute, Prominator.




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