The Cyber-Spy.Com Usenet Archive Feeds Directly From The Open And Publicly Available Newsgroup Sci.Electronics.Design
This Group And Thousands Of Others Are Available On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic, Opinions Or Content Posted To This Or Any Other Newsgroup. This Web Archive Of The Newsgroup And Posts Are For Informational Purposes Only.
From: "Nucharin W. Jansen"
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, 06 Nov 2002 05:58:14 +0700
Organization: C.S. Communications Co. Ltd.
Message-ID: <3DC84D06.4F43DDE9@fanwap.com>
References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net>
NNTP-Posting-Host: dial-12.ras-31.bkk.c.cscoms.com
Mime-Version: 1.0
NNTP-Posting-Date: Tue, 5 Nov 2002 22:58:17 +0000 (UTC)
To: Bob Wilson
X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U)
X-Accept-Language: en
I see. I will use switching current regulator now.
--snip--
>LEDs are not about voltage. They don't care about voltage. I've run them at
>2.5V. I've run them at 120V AC. LEDs are current devices and have a brighter
>response to more current. So any LED supply is about current management.
You are absolutely right. This question about Voltage and LEDs just
keeps
coming up time and time again! You'd think that those posing it would
take the
trouble to learn the most elementary basics of what they are trying to
work
with.
To make the principles perfectly clear, LEDs emit photons in an
approximate
ratio of the amount of CURRENT (hear that?...**current!!) that passses
through
them. Voltage isn't even in the equation!! The voltage that appears
across an
LED is a RESULT of the current that you are pushing through it, not the
other
way around!. Like any diode, this voltage (called the forward voltage)
tends
to be relatively constant, and relatively independent of the current.
But
(watch my lips closely, now!) the value of this voltage is basically
irrelivant! Forget about it! Don't even mention the "V" word when
dealing with
LEDs!
There! Got that off my chest.
Bob.
Go Back To The Cyber-Spy.Com Usenet Web Archive Index Of The sci.electronics.design Newsgroup
|