Re:

>I am building a 10mhz xtal frequency standard and am looking for a
>circuit diagram for a simple temperature regulator. I have the
>oscillator running in a small cast aluminum box and my idea was to bolt
>a power transistor to the case and use that as the variable heating
>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?


Don't know if the manuals are available on the web, but Stanford
Research Systems (http://www.srsys.com) includes schematics with all
their engineering products, and that would include the SR620 Time
Interval Counter, which has a TXCO option. You might get some ideas
from them ...
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  ______________________________________
   Andrew E. Kalman, Ph.D.   aek@pumpkininc.com

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