From: Tong Narak
Subject: Re: Best way to power array of LEDs?
Date: Wed, 04 Dec 2002 14:42:05 +0700
Organization: C.S. Communications Co. Ltd.
References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk> <email@example.com>
NNTP-Posting-Date: Wed, 4 Dec 2002 07:42:07 +0000 (UTC)
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LED look like simple but it is not simple.
In theory, you can't parallel LEDs.
But in practicle, I can parallel superbright LEDs.
Many car brake light, they parallel them too.
I mixed by parallel 3.4v 3.5v 3.6v 3.01v (forward voltage LEDs @20mA)
with a 3.6v regulator.
The forward current will vary automatic with the increment of
the input voltage.
the one 3.01v won't hog all current as someone said in this thread.
3.01v take ~150mA
3.4v take ~60mA
3.5 take ~40mA
3.6 take ~20mA
when remove the 3.01v LED, another LEDs still take the current
at the same value.
So. You can mix it in parallel. The lowest forward voltage LED
will not hog all current.
John Larkin wrote:
> On Tue, 3 Dec 2002 08:29:52 -0600, "James Sill"
> >LET THIS THREAD DIE
> Hey, if not for LEDs and resistors, this would be a deserted wasteland
> of a newsgroup. I wonder why people are so fascinated by LEDs?