On Friday, Jan 16, 2004, at 02:43 US/Pacific, =D6mer Yalh=FD wrote:

> Russel thank you for the answer.  I will do a search for Peltier and
> environmental chamber and see what comes up and go from there.  I need
> something that I can set between -25=B0C to +75=B0C (-13=B0F to =
+167=B0F) plus=20
> or
> minus 5=B0C, I don't need a very precise instrument.

the January Circuit Cellar Ink magazine had a project where the author
had converted a cheap (relatively speaking) peltier drink cooler into
a CPU-controlled temperature chamber.  It was quite a reasonable=20
article.
I believe they only got 8 to 60C out of it, though.  Peltiers are not
very efficient coolers, so it's hard to get very low temps, especially
if whatever you're cooling is generating any heat...

Used a PIC, too, I think.

BillW

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