: Thursday, January 05, 2012 5:50 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.) capacitors
In message
CAL8XPmO76XuTETZC=33_v2YWuJGcw8gCvtTDHyae6E4MFb18=g...@mail.gmail.com
, Azelio Boriani writes:
I have googled extensively
: Re: [time-nuts] Thunderbolt? (re simple gpsdo.) capacitors
In message
CAL8XPmO76XuTETZC=33_v2YWuJGcw8gCvtTDHyae6E4MFb18=g...@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
for a closed loop filters when a 10 %
leakage would be tolerable.
I tested a 10,000 sec TC filter using a 10 meg and 1000 uF, and got under 1%
leakage error open loop.
ws
***
[time-nuts] Thunderbolt? (re simple gpsdo.) capacitors
Poul-Henning Kamp phk at phk.freebsd.dk
The leakage
a 10 %
leakage would be tolerable.
I tested a 10,000 sec TC filter using a 10 meg and 1000 uF, and got under
1% leakage error open loop.
ws
***
[time-nuts] Thunderbolt? (re simple gpsdo.) capacitors
Poul-Henning Kamp phk at phk.freebsd.dk
The leakage current noise I
Perhaps the dual cap is a differential implementation of the filter/integrator.
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... don't know but judging from the very simple ASCII schematic I'll say no
because the lower capacitor is grounded. There is some sort of feedback I
can't figure out, too simple that schematic.
On Thu, Jan 5, 2012 at 11:27 PM, li...@lazygranch.com wrote:
Perhaps the dual cap is a differential
In message
CAL8XPmO76XuTETZC=33_v2YWuJGcw8gCvtTDHyae6E4MFb18=g...@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?
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 p...@phk.freebsd.dkwrote:
In message
Thanks. Me too: now I got it, sort of bootstrap and now I see that R2 is
needed because the real filter is R2*C2 and the leakage is not totally
compensated if C1 has to move to a new value - R*C1R2*C2.
On Fri, Jan 6, 2012 at 12:00 AM, paul swed paulsw...@gmail.com wrote:
Poul
Thanks have been
and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.) capacitors
In message
CAL8XPmO76XuTETZC=33_v2YWuJGcw8gCvtTDHyae6E4MFb18=g...@mail.gmail.com
, Azelio Boriani writes:
I have googled extensively trying to find something about the dual
Hi
Using electrolytic caps in timing applications is a bit exciting. Their
leakage current changes each time you change the voltage on them. It's
enough of a change to significantly impact long time constants. In some
cases the capacitance changes with voltage as well.
Temperature stability of
On Tue, Jan 3, 2012 at 9:14 AM, Bob Camp li...@rtty.us wrote:
Hi
Using electrolytic caps in timing applications is a bit exciting. Their
leakage current changes each time you change the voltage on them. It's
enough of a change to significantly impact long time constants. In some
cases the
Of Chris Albertson
Sent: Tuesday, January 03, 2012 12:35 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.) capacitors
On Tue, Jan 3, 2012 at 9:14 AM, Bob Camp li...@rtty.us wrote:
Hi
Using electrolytic caps in timing applications
no effect on it's
charge voltage.
I guess the charge is not Fixed, so not the same thing as changing the value
by paralleling the cap.
ws
**
[time-nuts] Thunderbolt? (re simple gpsdo.) capacitors
Bob Camp lists at rtty.us
Hi
No argument there, but this thread has wandered a bit
In message 80B26DC756AA45DD84E4EB9E14B58998@Warcon28Gz, WarrenS writes:
The leakage current noise I measured was way below insignificant when things
are properly scaled.
Really stupid question: Couldn't the double condensor from voltage
references trick be used to eliminate the leakage
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