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Topic: Rules of thumb for un-identified LEDs? (Read 587 times) previous topic - next topic

JimboZA

This thread made me wonder what values of LED voltage and current one could use for an un-dentified LED found in one's parts box?

Could one use about say roughly more-or-less approximately 2.5V and 20mA?

Osgeld

http://www.kpsec.freeuk.com/components/led.htm

scroll down, has a decent table
http://arduino.cc/forum/index.php?action=unread;boards=2,3,4,5,67,6,7,8,9,10,11,66,12,13,15,14,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,86,87,89,1;ALL

JimboZA

Thanks- I use that site quite often (and even post links here) but hadn't seen that table....

dhenry

5 - 20ma is a good number, and Vfwd would be Vfwd at such current levels.

Typically, they are good under 100ma.

rickso234

I agree with 5-20mA for most 5mm round LEDs, but I bought some high brightness 5mm whites that are 30-35mA. Then there are the" 5-chip" 10mm whites that are 100mA (20mA x 5 chips?).

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