Re: Current-driving a powerful IR-illuminator array

On Fri, 31 Mar 2006 08:09:48 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Fri, 31 Mar 2006 08:38:11 -0600, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:

On Fri, 31 Mar 2006 16:03:02 +0200, Jacques
<jacquesNOT.fournier@xxxxxxxxxxxxxxx> wrote:

Put the 40 LEDs in serie, so you only need one power supply, say
60..80V, with one resistor-in-serie (a few watts) and a MOSFET to switch
ON and OFF.

Jacques

---
From:

http://groups.google.com/support/bin/answer.py?answer=12348&topic=250

"Summarize what you're following up.

When you click "Reply" under "show options" to follow up an existing
article, Google Groups includes the full article in quotes, with the
cursor at the top of the article. Tempting though it is to just
start
typing your message, please STOP and do two things first.
Look at the quoted text and remove parts that are irrelevant.
Then, go to the BOTTOM of the article and start typing there.
Doing this makes it much easier for your readers to get through your
post. They'll have a reminder of the relevant text before your
comment, but won't have to re-read the entire article.
And if your reply appears on a site before the original article
does,
they'll get the gist of what you're talking about."




JF,

the schoolmarm thing is annoying. His response was perfectly
intelligible.

---
I wasn't commenting on the intelligibility, I was commenting on the
top-posting.

I notice you don't, [top post] and have commented, on occasion, that
it's not a good practice, so what's your problem?

--
John Fields
Professional Circuit Designer
.

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