Poul Thanks have been kind of following this thread and the diagram did not make a lot of sense. I figured I missed part of the thread. But this clears it up nicely. Regards Paul. WB8TSL
On Thu, Jan 5, 2012 at 5:49 PM, Poul-Henning Kamp <[email protected]>wrote: > In message <CAL8XPmO76XuTETZC=33_v2YWuJGcw8gCvtTDHyae6E4MFb18= > [email protected]> > , Azelio Boriani writes: > > >I have googled extensively trying to find something about the dual > >capacitor method of reducing the leakage current... nothing found. Please, > >can you indicate anything for me to learn more? > > It is very simple: > > R1 charges C1 to the DC potential and therefore C2 sees > (almost) no DC voltage, which means (almost) no leakage > current. C2 is still a capacitor for any AC or dV component. > > I belive I picked this trick up from a datasheet or app-note relating > to precision voltage references. > > Poul-Henning > > >> [Some op-amp] >-+-----R2-----+--> > >> | | > >> | ----- C2 > >> | ----- > >> | ____ | > >> +---|____|---+ > >> R1 | > >> | > >> ----- C1 > >> ----- > >> | > >> GND > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > 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.
