The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
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: "Frank Bemelman"
Subject: Re: current source for array of infrared leds
Date: Sun, 1 Dec 2002 21:40:30 +0100
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Organization: EuroNet Internet
NNTP-Posting-Date: 01 Dec 2002 20:40:39 GMT
"Harry Dellamano" schreef in bericht
> "Harry Dellamano" wrote in message
> > Hey Frank,
> > Driving LEDS in current mode sucks. There is no tempco tracking for
> > constant light and it's not efficient. Most larger arrays are driven in
> > constant voltage mode, look at traffic lights (300 LEDs, 2.5V, 0.03A, 20
> > Better efficiency and first order tempco tracking.
> > regards
> > harry
> I don't get it. I make a very controversial statement to this thread that
> contains many astute contributors and receive no feedback. At first I
> thought that maybe I am on everybody's kill file because this happens
> to me but the thread stopped completely like the plague had arrived.
> My style may be abrasive but I believe that there is some merit for
> constant voltage drive for LEDs and would like to discuss it. Am I so far
> off base that discussion is not possible. At least Robert would have given
> me some feedback.
Your style is OK. What I understood from the other responses, is that
a constant voltage - with a series resistor - is worth looking into.
I will look into that, make some measurements etc. It can take weeks
before I actually get around to do that - I have many things on my mind,
and this one can wait ;)
(remove 'x' & .invalid when sending email)
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup