unknown LED specs

[stormin norman]

I have a collection of various LED units I have no specs on. What is a 'safe/typical' resistor to use with them? Power supply could be anywhere from 3 to 9v...

 

[(*steve*)]

6V and a 470 ohm resistor.

The 6V means your LEDs are safe from reverse breakdown.

the 470 ohm resistor limits the current to something that is likely safe for any LED.

 

[Fish4Fun]

I keep a 1.5V AA wired with a 1k resistor handy for 100% sure-fire safe polarity testing. Even on a 3.6Vf/3W LED bead there is a faint glow good enough for indicating go/no-go testing.

Fish

 

[jarvisedwin]

6V and a 470 ohm resistor.

 

[(*steve*)]

6V and a 470 ohm resistor.

6V and a 470 ohm resistor.

How to get the attention of the moderators as a potential spammer.

 

[stormin norman]

Thanks everyone for the gracious help here...appreciate it. Always know I can get help here from the brain pool....