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Gadget Freak Case #218: Finally – A Decent Space Heater Thermostat

Andrew Morris designed an electronic thermostat that senses actual room temperature. He tested and tweaked the design to get the proper control range and hysteresis.
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6/29/2012 | 3 comments
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Charles Murray
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Cost and applications
Charles Murray   7/6/2012 7:02:16 PM
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Clever design, Andrew. Congrats. I'm curious about the cost of this compared to conventional technology. Is the cost higher? Are there some applications that would need this extra precision at any cost?

armorris
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Re: Cost and applications
armorris   7/12/2012 6:23:13 PM
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If you bought all the parts new, it would cost you about $30 to make. Depending on where you live, it might take a couple of years to get that back, but your comfort level will be greatly improved. The circuit can be made to be much more precise if needed. I'd replace the SCR power supply with a zener diode circuit or added an electronic regulator. This would only be needed if you used the thermal air pump to pull air through the box. If you used an isolated 24 volt power supply, the temp sensor could be brought outside the box, eliminating the need for the thermal air pump and any kind of regulated power supply.

armorris
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Platinum
Construction details
armorris   1/26/2013 3:12:05 PM
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Here is the link to the actual article with a schematic and all construction details.

 

http://www.designnews.com/author.asp?section_id=1362&doc_id=246304

 

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