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 or
minus 5=B0C, I don't need a very precise instrument.

Thank you,


-----Original Message-----
From: pic microcontroller discussion list =
[mailto:PICLIST@MITVMA.MIT.EDU] On
Behalf Of Russell McMahon
Sent: Friday, January 16, 2004 12:19 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE:] About test boxes (hot and cold)

> I don't know if this is EE or OT; however, I need a box where I can=20
> set
the
> temprature inside it (within a certain error margin) and keep it the=20
> same temprature (again within a certain error margin).  I will use=20
> this box to put some electronic boards into temprature tests.
>
> Is there a name for this "box"?  Any recommendations?

EE I'd say.

One name would be an "environmental chamber". Depending on how hot or =
how
cold you want to go, a Peltier effect controlled refrigerator as sold in
many US stores may do the trick. The Peltier device can either heat or =
cool
(by reversing polarity). Typical cool boxes have a 50 watt Peltier and a =
fan
and are large enough to take 4 to 6 large soft drink bottles.

A controller can be made that will seamlessly switch the Peltier device =
from
heating to cooling as required.



        RM

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu