AW: [Re: thermal tips re expo converters:]

[Ian Fritz]

Terry --

> 
> The oscillation frequency of a quartz crystal has a zero tempco at only one
> specific temperature.  HP and others cut the crystal so the zero tc point
> is well above ambient temperature, then elevate the crystal to this
> temperature and hold it there with a feedback loop, heater, and sensor.
>

Yes, I understand that, of course. My point was simply that once you get
there, df/dT=0, a huge advantage over the expo converter case.

  Ian