Re: How to drive High Power Infrared Led - Epitex L940-66-60


news.aruba.it wrote:

The resistor should be able to dissisape 10W when it will be asked to
dissipate just If * Vr = 800mA * (12-7.1)V = 3,92 W

The problem is: the resister gets VERY,VERY hot in just a minute. You cannot
touch it !!

What is wrong ???

Any ideas ??

Thanks in advance for your help.

Antonio

The resistors can stand a lot higher temperature than we can. Will it
be somewhere that people are likely to touch it? If not, I wouldn't
worry about it; you're below 1/2 the rated power.

Mark

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