Re: Best way to power array of LEDs?

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#101

From: Tong Narak
Date: Wed, 04 Dec 2002 07:42

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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.

Tong

John Larkin wrote:
> 
> On Tue, 3 Dec 2002 08:29:52 -0600, "James Sill" <sill@mcleod.com>
> wrote:
> 
> >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?
> 
> John

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From: Tong Narak <tong@fanwap.com>
Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair
Subject: Re: Best way to power array of LEDs?
Date: Wed, 04 Dec 2002 14:42:05 +0700
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