[Lowfer] Temp control...

[Dale Rice]

In some of the commercial XTAL ovens I have looked at they use transistors
to do the heating. I suppose the advantages are that they are cheaper than
resistors, easier to mount, and their gain can be used as part of that
needed in the circuit.
A 2N3055 would be good and cheap or even a 7805 regulator IC with the output
grounded. The regulator IC is made to withstand abuse and get hot.

Dale Rice
KC7YKU

>
> I first thought of series, then thought of a loopback design, what about a
> low voltage regulated bulb attached directly to the crystal, adjusted for
> reasonable temperature, for example, 2.1V could equal around 70�.  > Kurt