[time-nuts] Improving the stability of crystal oscillators
Richard (Rick) Karlquist
richard at karlquist.com
Sun Oct 14 01:11:41 EDT 2007
Neon John wrote:
> Nah, not for this application. A Peltier module typically has a COP of 1. That is,
> it moves a watt of energy for each watt consumed. Thus, for each watt moved, two
> watts have to be dissipated to air.
> I can't imagine a well-insulated quartz oscillator needing more than a watt or two of
> cooling at the most. A heat sink capable of handling 4-5 watts should do the job
> just fine.
> Don: I've seen peltier-controlled "ambient" ovens before but I can't recall the
> details. I'm fairly sure one was a Fluke precision voltage transfer standard in
> which the zener reference diode was controlled to a constant temperature.
The problem with Peltier coolers is that they have low thermal
resistance to ambient. This makes them suitable only for
non critical ovens.
Rick Karlquist N6RK
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