my leds not work

is it possible to run 5mm white(3.3v each) 6 led series by 5v adapter without any rasister????

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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.

neelpal (author)  Jack A Lopez9 days ago

what is

(diode forward voltage) how di i khow

You say in your question, 3.3 V !

neelpal (author)  steveastrouk8 days ago

thanks....

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

neelpal (author)  Downunder35m9 days ago

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

No.