From: Lizard Blizzard
Subject: Re: Best way to power array of LEDs?
Date: Wed, 06 Nov 2002 10:11:13 -0800
References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <2Qan9.3129$cS4.firstname.lastname@example.org> <3DC843FE.4A25FFF3@fanwap.com>
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Nucharin W. Jansen wrote:
> What's happen when voltage drop across LEDs are not same ?
> I have problem with white LEDs in series.
> I can't control the current.
> I have to adjust in real work one by one in each branch.
You say the LEDs are in series, so the current is identical in each one.
All you have to do is put a current limiting resistor in series with
those, and use a value that will give you the right current thru all.
If you made a mistake and meant parallel, then yes, you should not
connect LEDs in parallel without a resistor in series with each LED to
limit and equalize the current.
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