Rick, Thanks for this information. Actually the technology of C18 is not specified in the manual. Why should it necessarily be « foil » type and metallized? Is « foil » type same as « film » type? Of course the « mass » needs to be there (=> 3D printing services) Best Gilles.
> Le 15 sept. 2019 à 04:43, Richard (Rick) Karlquist <[email protected]> a > écrit : > > The 10811 oven loop is only barely stable. It's stability > is limited by the amount of capacitance that you can > get in a cap of the size that will physically fit. BTW, this > cap must be of the foil type, not the metallized type. > If you are building a knock off of the 10811 and you can > fit in more microfarads, you can make the loop work better. > In the 40 years since the 10811 was designed, AFAIK, there > as been zero (0) progress with respect to the capacitance > per cubic centimeter of foil capacitors. > > Of course, the real solution is to use a PII^2D controller > like the E1938A. > > Also, if you are not using a 10811 oven mass, then all bets > are off with respect to the oven design. You'll be starting > all over from t=0. > > Rick N6RK > >> On 9/14/2019 9:41 AM, Ulf Kylenfall via time-nuts 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. _______________________________________________ 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.
