Thanks Stanley,
I placed the Mouser order tonight (based on Bob Camp's project he
updated). I'm no expert either... but I'd still like to know what are the
best options for an enclosure and external connectors... The rest I'll
leave up to it all being relative and it is what it is...
73 Brice KA8MAV
- Original Message -
From: Stanley Reynolds stanley_reyno...@yahoo.com
To: time-nuts@febo.com
Sent: Saturday, August 14, 2010 12:56 PM
Subject: [time-nuts] Fw: What's the latest correct PICTIC II
Mouserproject?-Heathkid
Duplicate message without in-line picture.
- Forwarded Message
From: Stanley Reynolds stanley_reyno...@yahoo.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sat, August 14, 2010 11:41:36 AM
Subject: Re: [time-nuts] What's the latest correct PICTIC II Mouserproject?-
Heathkid
1) I have no previous experience building precision anything, I'm not an
expert.
2) My guess is the design expects quality components and depends on the auto
calibration to correct any component drift.
Short term stability between calibrations is what we want. The absolute
value of
C16 and C17 is not as important as it's stability in leakage and value.
Guess we could put the didoes in a constant temp oven but not sure all the
components are more stable at higher temps.
Good ideas about didoes here :
http://www.sciencebuddies.org/science-fair-projects/project_ideas/Elec_p033.shtml
(note Figure 3 and how the didoes voltage drop is more linear at higher
temps vs
room temp.)
Stanley
From: Heathkid heath...@heathkid.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sat, August 14, 2010 10:43:15 AM
Subject: Re: [time-nuts] What's the latest correct PICTIC II Mouserproject?-
Heathkid
Okay Stanley... I've got a Tektronix 370A curve tracer at work. So the
diodes
need to be matched? No problem.
So I match the diodes and the resistors to within 0.001%. Are there any
other
components that need matched? Also, you mentioned using hemostats as
heatsinks
on the diodes while installing them. I know that diodes make very good
temperature sensors as well. Are there any suggestions on keeping them
stable
after they are on the board? What is the recommended operating temperature
of
the PICTIC II?
Thanks.
73 Brice KA8MAV
- Original Message - From: Stanley Reynolds
stanley_reyno...@yahoo.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, August 14, 2010 10:43 AM
Subject: Re: [time-nuts] What's the latest correct PICTIC II Mouserproject?-
Heathkid
snip
Maybe we should buy lots of diodes to match them, they are relative cheap,
also
use extra care installing them. Using hemostats as heat sinks and just
enough
heat for a good connection do not want to damage/change them after the
match.
Stanley
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