0Jack A LopezBest Answer 11 months ago ReplyUpvoteYou should use some resistors. The math for calculating what size resistors is pretty easy. Also pages like this,http://led.linear1.org/1led.wizhttp://led.linear1.org/led.wizcan do the math for you. If you know how much current you want to flow through the LEDs, then use that number. Otherwise, I suggest 20 milliamperes (20 mA) as a typical, safe but still bright, amount of current for a 5 mm size LED.

0Downunder35m 11 months ago ReplyUpvoteYou don't need another topic for this as you already got the answer in your previous one ;)

0neelpalDownunder35m Answer 11 months ago ReplyUpvotei didn't know before my first question was answered i show it aftere post this question

## Discussions

Best Answer 11 months ago

You should use some resistors.

The math for calculating what size resistors is pretty easy. Also pages like this,

http://led.linear1.org/1led.wiz

http://led.linear1.org/led.wiz

can do the math for you. If you know how much current you want to flow through the LEDs, then use that number. Otherwise, I suggest 20 milliamperes (20 mA) as a typical, safe but still bright, amount of current for a 5 mm size LED.

Answer 11 months ago

what is

(diode forward voltage) how di i khow

Answer 11 months ago

You say in your question, 3.3 V !

Answer 11 months ago

thanks....

11 months ago

You don't need another topic for this as you already got the answer in your previous one ;)

Answer 11 months ago

i didn't know before my first question was answered i show it aftere post this question

11 months ago

No.