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From: Fred Bloggs
User-Agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0
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Subject: Re: thermostat for heat lamp w/ remote probe
Date: Wed, 11 Dec 2002 15:02:15 GMT
NNTP-Posting-Date: Wed, 11 Dec 2002 07:02:15 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
Jason A. Arends wrote:
> 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.
What is the maximum wattage of the heat lamp, and is it 120VAC @ 60Hz? A
continuously variable controller could consist of a variable output
switchmode voltage regulator supplying voltage to a homebrew 60HZ
inverter. There are plenty of examples of both that could be constructed
from scratch or made from existing products.
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