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From: "Jason A. Arends"
Subject: Re: thermostat for heat lamp w/ remote probe
Date: Wed, 11 Dec 2002 12:45:06 -0600
Organization: Cedar Falls Utilities
NNTP-Posting-Date: Wed, 11 Dec 2002 18:45:07 +0000 (UTC)
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Fred Bloggs wrote:
> 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.
i think the lamp i have is a 75 watt bulb. yes it's 120VAS @ 60Hz
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