[time-nuts] Frequency referenced temperature regulator
Mark Sims
holrum at hotmail.com
Mon Nov 8 16:32:30 UTC 2010
Well, you could just toss a Thunderbolt into the box and use Lady Heather to do the temp control. Using just a fan and cardboard box and maybe some thermal mass, you can stabilize the temperature to within a few millidegrees (microdegrees long term average) as long as the desired temp is between ambient and say 50-60C. To go below ambient you would need a peltier. You could move the temp sensor off board to keep the tbolt self-heating out of the environment.
I have an ESI SR104 standard resistor and Tbolt mounted in a box. The control temp is set at one of the two points where the SR104 is at precisely 10,000 ohms... just for good measure I also have a precision 10 volt reference and a 0.01uF cap in there also... four standards in one box all basking in the warm glow of a Tbolt.
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