a peltier will shoot for roughly 65C temperature difference hot side to cold
side.

A peltier that pumps 72W of heat will also produce 72W of heat (IE 144 watts
must be disipated from the hot side)

you can stack them if you want
IE 1 peltier level 1 then 2 at level 2 etc

They do < 0 temps quite easily.
There are some issues with switching them I think you want it > 2khz or
really slow but i dunno that for sure.
if you are in australia oatley electronics sells them pretty cheap.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jinx
> Sent: Friday, 16 January 2004 9:41 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE:] About test boxes (hot and cold)
>
>
> > January Circuit Cellar Ink magazine had a project
>
> > 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
>
> Perhaps a little dry ice (-79C) ?
>
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