); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Great idea!!,....................................Don C.
----- Original Message ----- From: "Max Robinson" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Saturday, October 27, 2007 10:07 AM Subject: Re: [time-nuts] Parallel voltage regulators > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > I do have some experience with temperature controlled ovens. I found that > a > long term plot of the temperature while using an unregulated supply on the > oven heater showed small random variations due to voltage variations. > When > the oven heater was put on a regulated supply the line became flat. The > problem here seems to be during the heat up cycle. The voltage doesn't > need > to be regulated during that time. You might try sensing the error signal > and when it is outside of the linear control range you could switch in a > parallel transistor and resistor to handle the warm-up current and it > would > switch out when the oven has stabilized at the lower current. > > Regards. > > Max. K 4 O D S. > > Email: [EMAIL PROTECTED] > > Transistor site http://www.funwithtransistors.net > Vacuum tube site: http://www.funwithtubes.net > Music site: http://www.maxsmusicplace.com > > To subscribe to the fun with tubes group send an email to, > [EMAIL PROTECTED] > > ----- Original Message ----- > From: "Bill Hawkins" <[EMAIL PROTECTED]> > To: "'Discussion of precise time and frequency measurement'" > <[email protected]> > Sent: Friday, October 26, 2007 1:21 AM > Subject: Re: [time-nuts] Parallel voltage regulators > > >> There is a concept in temperature control called feed-forward. >> >> In this case you would sample the supply line with an inverting >> amplifier and use it to increase the oven drive signal as the >> line voltage decreases. The goal is to keep the integral term >> from changing as the line voltage changes. It is not as easy >> as it sounds. >> >> Bill Hawkins >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> >> -- >> No virus found in this incoming message. >> Checked by AVG Free Edition. >> Version: 7.5.503 / Virus Database: 269.15.11/1094 - Release Date: >> 10/26/2007 8:50 AM >> >> > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
