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Thread: crystal oven cct?
face BY : Mike Hardwick email (remove spam text)

Thermal control hardware can be simplified if you have a micro in the
system... Use a DS18S20 or similar temp sensor (takes one I/O pin) and a
software-controlled heater (one more I/O pin). The heater can be a cheap
power transistor in a constant-current circuit (with another small
transistor). With some attention in software to thermal delay, etc., you
can get excellent results with this approach. A PWM generator can
"linearize" heater response...

Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!

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In reply to: <20011003.095905.-329069.3.haroldhallikainen@juno.com>
See also: www.piclist.com/techref/index.htm?key=crystal+oven+cct
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