led voltage

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twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: January 15, 2008 at 8:03 PM / IP Logged

Basically I have about 14 Blue Led's that I ripped out of my car (previous owner installed them) and I have no idea as to the voltages for them. Is there anyway to test it using my protoboard.

And if yes once I have that number how do I use it to figure out the proper resistor sizes for the leds?

tedmond

Gold - Posts: 4,610

This member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.

Joined: January 06, 2007

Location: Ontario, Canada

Posted: January 16, 2008 at 2:59 PM / IP Logged

were all 14 wired together? or spererated?

twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: January 17, 2008 at 11:27 AM / IP Logged

he had them wired in groups of say 2 or 4 or 5 it was all randomly done thats why I disconnected them. I am now looking to regroup them but I dont know anything about them except that they are blue leds...so basically are they useless now or what?

tedmond

Gold - Posts: 4,610

Joined: January 06, 2007

Location: Ontario, Canada

Posted: January 17, 2008 at 2:46 PM / IP Logged

they are not useless, they are still functional. if you plan to wire them seperatly a 480 - 550 ohm resistor will do for each bulb. or you can wire them in series in multiples. may i ask where you might be placing them?

twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: January 21, 2008 at 4:41 PM / IP Logged

I was going to wire them under the dash to get a blue glow by my feet and the passenger's feet. I was thinking of wiring them in groups of say 4 or 3 so if I was to do that how does the math work. is it say 480 ohm / 3 then one of those for each one? Also I dont have them infront of me but I have about 14 so if you could just do a simple example of how the math works so i can wire it all properly.

Also if im doing groups of 4 would parallel not be better incase one blows? Or is series recommended?

tedmond

Gold - Posts: 4,610

Joined: January 06, 2007

Location: Ontario, Canada

Posted: January 22, 2008 at 7:37 PM / IP Logged

well LEDs have the long life span, but it might be as bright as underglow(neon) doing a google search on LED calculator will bring up many pages. Using one of the online guides will work for you.

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led voltage

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