I understand several of the modern MEMS OCXO's use microcontroller PID control for the temperature, avoiding the need for any large capacitors for compensation.
The microcontroller does a lot more than the heating job, judging by the PhD thesis I see coming out of China. They seem to feed-forward the delta temperature into microtemperature oscillator compensation too so it's less like a traditional OCXO and more like an OCXO with some TCXO enhancements. Tim N3QE On Sat, Sep 14, 2019 at 5:01 PM Ulf Kylenfall via time-nuts < [email protected]> wrote: > > Yes, I have more or less cloned the temperature regulation circuitryand > used it for various heat control circuitry using > other/similarsemiconductors that can handle elevated temperatures. > The basic principle is nothing exotic. It can be found inmany applications > all over the internet. > > What is important is that the feed-backto the thermistor bridge (R+C) is > selected for a proper timeconstant so that the regulation does not > thermally oscillate. > > The thermal delay between the mechanics/heat dissipatingcomponents and the > isolation resistance between the thermistorand chassis is also important. > > > All the best > Ulf KylenfallSM6GXV > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
