[time-nuts] Trak Systems 8900 manual
I am adding support to Lady Heather for some Trak Systems GPSDOs.I think I have the 8820. 8821, and 9100 covered. Does anybody know where I can find a Trak Systems 8900 manual? ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Maas-Rowe DCB1 Circuit Diagrams, Time Regulation (other than 60Hz) revisited
For those who might still be interested in a modification to use another source besides 60Hz pulses to keep the clock "on time", I now have the full set of circuit diagrams for this bell clock-controller. If anyone wants to take a look at them, please email me privately at organli...@sonic.net Thanks Donald Resor N6KAW ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Building a DMTD/phase noise set in the 21st century
You can also try capacitance multiplication with an active (power gain) device - of course, it needs to have commensurately low noise too. I had a few schemes sketched out years ago, for extra filtering a low noise voltage reference I intend (some day) to build, using some of the 2SK160 (as I recall) series low noise JFETs. For bypassing, it can be fairly straightforward. For input or inter-stage coupling, not so much. Ed ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Building a DMTD/phase noise set in the 21st century
Thank you Bruce, I have a couple of bags of small supercaps (1 to 3F range). The ESR is not negligible (50 to 60 Ohms) but for applications where you need a very low cutoff in an A/C coupled circuit, they will do a good job, or to replace battery backup in some applications. For bypass, they will need help with lower ESR conventional electrolytics. On Sun, Aug 25, 2019, 10:16 PM Bruce Griffiths wrote: > I've only used an ultra low esr 33F supercap made in Korea in the source > circuit of the input JFET on a preamp. > Down to 10Hz at least it didn't appear to add significant noise to the > 4nV/rtHz @10Hz preamp. > > Bruce > > On 26 August 2019 at 13:52 Didier Juges wrote: > > > > > > How do SuperCaps compare with electrolytics noise-wise? > > > > Didier KO4BB > > > > On Sun, Aug 25, 2019, 9:04 AM Gerhard Hoffmann wrote: > > > > > > > > Yes, these electrolytic capacitors can produce ugly effects. > > > > > > The winner is clearly the cheap > > > > > > < https://www.digikey.de/products/de?keywords=1189-1056-ND > > > > > > > > > ___ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
