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,

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


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