problem with led's

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adamtaylorpcb

Member - Posts: 6

Joined: December 27, 2008

Location: Florida, United States

Posted: January 01, 2009 at 7:19 PM / IP Logged

i found several small 3 led clusters in the shop while cleaning it out. i ran wires off of the leads and tried it on a 12v source and nothing happened. not much experience with leds. do i need to put a resistor or something on them or are they blown

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ckeeler

Gold - Posts: 1,461

Joined: June 20, 2008

Location: New Mexico, United States

Posted: January 02, 2009 at 11:27 AM / IP Logged

they are most likely burnt out. when you connected them did they flash on for just a brief second, and then nothing? if so you burned them out when you connected them. especially if you did not connect them with a resistor.

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adamtaylorpcb

Member - Posts: 6

Joined: December 27, 2008

Location: Florida, United States

Posted: January 02, 2009 at 12:14 PM / IP Logged

yeah, the one i tried did that

how will i find out what resistor i need?

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ckeeler

Gold - Posts: 1,461

Joined: June 20, 2008

Location: New Mexico, United States

Posted: January 02, 2009 at 12:30 PM / IP Logged

Do you know anything about them? how many are in each cluster? 3?

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KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: January 02, 2009 at 1:40 PM / IP Logged

What are you trying to get the LEDs to do? With three LEDs you should be more then safe to run a 1K resistor in series with the cluster. You can then gradually step down the resistance size if you want the LEDs to be brighter.

The proper way to size the resistor is to use the forward current rating of the specific LED you are using. However, since it is unlikely you know the part number of the LEDs you will just have to experament a bit.

Kevin Pierson

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problem with led's

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