From: Watson 'Atto Parsec' Name
Subject: Re: Best way to power array of LEDs?
References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk> <email@example.com> <3DEDB1CD.EF3761C7@fanwap.com>
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Date: Wed, 4 Dec 2002 21:00:20 -0800
NNTP-Posting-Date: Wed, 04 Dec 2002 22:01:21 PST
Organization: InReach Internet
In article <3DEDB1CD.EF3761C7@fanwap.com>, firstname.lastname@example.org talked about...
> 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
The above shows that the lower voltage LEDs hog most of the current.
> 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.
Well you just showed values that contradict what you say.
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