[time-nuts] Thunderbolt? (re simple gpsdo.) >> capacitors
paul swed
paulswedb at gmail.com
Thu Jan 5 23:00:10 UTC 2012
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 <phk at phk.freebsd.dk>wrote:
> In message <CAL8XPmO76XuTETZC=33_v2YWuJGcw8gCvtTDHyae6E4MFb18=
> g at mail.gmail.com>
> , 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
> phk at FreeBSD.ORG | 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 -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
More information about the Time-nuts_lists.febo.com
mailing list