[time-nuts] 10811-Parts... (Using the thermal regulator circuitry)

[Tim Shoppa]

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 <
time-nuts at lists.febo.com> 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
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