>Hi Debbie,

Hi Debbie,

That's WAY TO MUCH money!

Strongly suggest ebay IF you want to buy in quantity!

I did a quick search on ebay. IR diodes and IR diode assy's are available.
Here's a few URL's to look at:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3034934776&category=14957

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2542729929&category=26207

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2940011240&category=19270


Additionally, you might use 1 or 2 of the high power diodes from Luxeon.
They cost more to buy initially, but they last longer because they have
proper heat sinks.

I'm curious why you want to pulse them. If you are doing it to get more
power, you might want to consider buying the Luxeon diodes and not having
to pulse them at all!

Do beware however...LED's have a finite lifetime. Although rated at
~100,000 hours MTBF, that rating goes out the window when you pulse them
beyond their ratings. If you need an IR source to run for a long time, or
in a critical ap or in a high rel ap, you might buy the luxeon diodes instead.

Also, most LED's do not fail outright and go short or open:>: They fail by
loosing output power over a period of time. I think the 100,000 hour rating
is the time it takes for them to loose 3db of their output power. It's a
long slow decrease in output that one doesn't expect:>: Of course, the
output goes downhill faster if they are run much past their ratings.

Good luck.

Art


> >ie Could the PIC could freeze up and latch the LEDs in an ON state as Vcc
> >declines? What should I be on the look out for & ways to guard against? If I
> >get round to building a full array, it'll be 9x7 IR LEDs @ maybe $1 each
> so u
> >absolutely, positively don't want a latch on. :( Looking for ideas ....
> >Thankz - Debbie
>
>
>$1 seems a bit expensive for the LEDs. especially in that quantity..!

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