How do you tell which side of a 0603 SMD LED light is positive/negative?

[Darkzero]

One side is marked with a green dot, the other isn't. That's the only sort of sign i have >_<

Please help.

[Nemesis]

The one with the green dot is negative. If it has an arrow, then the end its pointing towards is negative.

[Darkzero]

Thank you a lot.

The LED voltage is 3.0-3.2, 20mA.

If i solder wire on both ends of the LED, then attach is to a 1.5v AA battery, it should still glow dim, right?

EDIT:
Also, the sticky says:
"Solder (preferably 60/40 rosin core, but 63/37 tin-lead will also work, it is not recommended that you work with lead free solder)"

Im using 62/36/2 Silver-Bearing Solder. Does that make a huge difference?

[Darkzero]

Man, i'm sorry for all the questions. Now that i've finally got all the supplys, all these small things are popping up that I never thought of before.

For resistors, does it matter which end you solder incoming current's wire to? There's different colored rings..i'm not sure how much of a difference it makes or not. ><

[bustinthejustin]

Resistors, I believe don't make a difference which way you solder it. Different colored rings just tell you the resistance of a resistor.

Here's a nice link that teaches you to identify resistance with the color bands...

http://wiki.xtronics.com/index.php/Resistor_Codes


For the led test, 1.5v battery might be pushing it. If you have a multimeter, use the diode test. Not sure about your solder though.

[Darkzero]

Resistors, I believe don't make a difference which way you solder it. Different colored rings just tell you the resistance of a resistor.

Here's a nice link that teaches you to identify resistance with the color bands...

http://wiki.xtronics.com/index.php/Resistor_Codes


For the led test, 1.5v battery might be pushing it. If you have a multimeter, use the diode test. Not sure about your solder though.

The bottom of your link answered my question great.

Resistors Have no polarity; they can be installed either way, but it is best to put them in all facing the same way
so as to make reading them easier and to develop the habit for parts that do have polarity. Best to put the tolerance
band on the right, while the reference designators on the circuit board are upside up.

Thanks ^-^

As for the LED testing, how would 1.5v be pushing it?..The voltage is lower than whats required, so there's no chance of it blowing the LED right?

[bustinthejustin]

Yeah. Sorry wrong choice of wording, but I meant pushing it as in 1.5v may or may not light it. That's a little far from the normal forward voltage.

[Darkzero]

Okay. :x

I'm going to go ahead and use the silver solder and hope for the best. Thanks again for all the help.

[bustinthejustin]

Yeah no problem. I think there's a way to wire up to AA batteries to get the full 3v, but I can't remember if it's series/parallel/something else. I just suggest getting a multimeter for 20 bucks and using the diode test.

[Alien_X]

Your solder is better.

[Darkzero]

Cool, thanks.