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Old 06-23-2008, 03:25 PM   #1
STIckySTIfee
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Default Do i have the wrong LED?

I am changing my hvac color from green to red in my 2004 STI. I purchased (4) 5mm Red LED 1.7 Volt 20mA 3000mcd from radioshack. I put the new leds in the holders and installed. I turned the key to the on position, and all four lights turned on for a split second, and shut off. Are these the wrong LEDs i need for this application? cesar? anyone? help me!!!!
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Old 06-23-2008, 03:49 PM   #2
Mulder
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You took out 12V bulbs and put LEDs in their place. 12V applied directly to an LED without a dropping resistor = burned out LED.
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Old 06-23-2008, 03:53 PM   #3
STIckySTIfee
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what dropping resistor would i need to do this? part number? website? how do i install it on the leds?
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Old 06-23-2008, 04:17 PM   #4
Mulder
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You'd have to do an Ohm's Law calculation based on the nominal current of the LED and the supply voltage. In this case, using 12V and 20ma, R=E/I so R comes out to 600 ohms. Allowing for higher voltage when the car is running, say 14V, makes it 700 ohms. You could probably go to 1K ohms for safety and not see much difference in the brightness of the LEDs.
As for where to install the resistors you'd have to wire them in to the circuit someplace, if you're sticking the LEDs in the bulb holders there is no place for them there.
There may also be premade 12V LEDs with integrated resistors that you can use for this application, if so that's a better way to go. I'm sure if you search the many threads that already exist on this topic you'll find more info. There's a sticky thread in this forum and also in Interior/Exterior.
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Old 06-23-2008, 04:25 PM   #5
Mechie3
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www.ledcalc.com

Tells you what resistor you need and the color bands too.
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Old 06-23-2008, 08:10 PM   #6
STIckySTIfee
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that took care of it, glad thats over, thanks for the help fellas.
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