>element. I would then mount the whole unit inside a block of foam
>insulation. I would like to hold the crystal at a non critical
>temperature between 35-50C. Any ideas?

The temperature is critical.  You want to hold it at the turning point of
the specific crystal where the Tc is zero.  Most common cheap AT cut rocks
are ground to have their turning point near room temperature.

I'd probably use a thermistor bridge circuit mounted in contact with the
heating device.

You might also read through:
        http://www.karlquist.com/osc.pdf


newell

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