[time-nuts] Frequency referenced temperature regulator
William H. Fite
omniryx at gmail.com
Mon Nov 8 15:15:09 UTC 2010
This project has to qualify for the *Yes, I Really AM a Time Nut*certificate.
I can fix you up with a temperature monitor that will page you or text your
cell phone if the temp goes out of range.
Let us know how it goes.
On Mon, Nov 8, 2010 at 10:04 AM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:
> I'm contemplating building a small temperature control enclosure for
> testing various electronics.
> I have a handful of peltiers suitable for the purpose, and was
> pondering the right control mechanism.
> Most people would reach for a NTC, put it in a wien-brige etc etc.
> But since I happen to have access to much more stable frequencies
> than voltages, I thought of a different way:
> 1. Mount a X-tal-osc with really lousy tempco inside the enclosure.
> 2. Compare its output to a stable reference frequency.
> 3. Use the output of the phase comparator to drive the Peltier.
> It is basically a PLL where temperature is used as EFC...
> Has anybody tried that ?
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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