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From: John Woodgate
Subject: Re: thermostat for heat lamp w/ remote probe
Date: Wed, 11 Dec 2002 07:42:10 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 11 Dec 2002 08:48:39 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Jason A. Arends
wrote (in ) about
'thermostat for heat lamp w/ remote probe', on Tue, 10 Dec 2002:
>i currently use a heat lamp hooked up through a rheostat that i can
>manually adjust for temperature based on a digital thermometer with an
>in/outdoors feature (outdoors uses a probe on a wire). i'd like to make
>a thermostat that will control the intensity of the light based on the
>temperature according to a setting that i make on a dial. i don't want
>it to be an on/off thermostat, but a continuously variable design so the
>temperature is more stable. a common one used is here:
>http://helixcontrols.com/prod_dbs1000.htm but it's digital and costs
>$120. i don't need any fancy features, just a dial. it doesn't even
>have to be calibrated, i can find the correct temp by trial and error.
>the temperature sensor should be small and on a long wire, like a
>thermistor probably. the probe goes in my gecko's cage. is this
>something that can be done easily? i've seen designs for a temperature
>controller using a wheatstone bridge but i have no idea how to make the
>AC vary with this idea.
Anything you can make will cost you more than $120 and take you many
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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