LED question

Post by **Skyone** » Wed Jun 07, 2006 3:36 pm

vskid wrote:I tried one LED with a 1 ohm resistor and it got warm in a few minutes, so I tried adding another 1 ohm resistor (1+1=2 ohms) and it got about as warm in 15 minutes. I was running it off of a lm317 outputing about 3.3v. Should I add a bigger resistor, or is it okay for the LED to get warm?

What's the voltage source? What's the LED rated at (in voltage, usually 2v-4v)? What's the LED's consumption (in mA, usually 10mA or 20mA)?

vskid · Post by **vskid** » Thu Jun 08, 2006 8:35 am

Skyone wrote:
vskid wrote:I tried one LED with a 1 ohm resistor and it got warm in a few minutes, so I tried adding another 1 ohm resistor (1+1=2 ohms) and it got about as warm in 15 minutes. I was running it off of a lm317 outputing about 3.3v. Should I add a bigger resistor, or is it okay for the LED to get warm?
What's the voltage source? What's the LED rated at (in voltage, usually 2v-4v)? What's the LED's consumption (in mA, usually 10mA or 20mA)?

The ebay listing said they were rated for 3.3v and 20ma, not sure how reliable that is.

Post by **Skyone** » Thu Jun 08, 2006 3:46 pm

What is the voltage source? (9v? 7.2v?)

vskid · Post by **vskid** » Thu Jun 08, 2006 4:21 pm

Skyone wrote:What is the voltage source? (9v? 7.2v?)

3.3v