Bob,
Thanks for the update! How critical are the values of the components? If
I'm going to build this (actually six of them)... I'd prefer to do it right
(and best) the first time. Going from a 620ohm 1% to a 619ohm is probably
negligible. But if it's design is *supposed* to require a 620ohm 1% 50ppm
metal film resistor then shouldn't that be what I should get (even if I have
to get it from a different source)? Maybe I'm being *really* picky here...
I do tend to take things to **extremes**. Even the people I work with get
frustrated sometimes with me because when I build things... I tend to match
resistors, caps, inductors, etc. to within 0.001% of what the design
specifies. Yes... I've bought 400 resistors for a headphone amplifier just
to find two that were matched perfectly (even at temperature changes - 0C to
40C).
Also, when building... can the standard IC's be socketed - I like it that
way (I'm sure the PIC is okay)? I know that affects some circuits. Do you
know if this will have any effect on the operation or accuracy of the PICTIC
II? If it's okay... standard or machine pin (if it makes a difference).
And finally... *what* should the input/output connectors be? Thanks again!
73 Brice KA8MAV
----- Original Message -----
From: "Bob Camp" <li...@rtty.us>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Friday, August 13, 2010 5:34 PM
Subject: Re: [time-nuts] What's the latest correct PICTIC II Mouser
project?- Heathkid
Hi
Shortages... what shortages :)......?
The two offending resistors have been "bumped" to 1% standard values from
5% standard. Functionally there should be no difference at all.
Sorry for the delay in getting it up dated.
Bob
On Aug 13, 2010, at 1:47 AM, Heathkid wrote:
Hello everyone. I received my six (6) PICTIC II PCBs which are
absolutely beautiful (after a couple minutes of standard cleaning with a
pencil eraser which I do anyway to *any* PCB* I order) and I was getting
ready to place my order for the components tonight but the following (in
the "latest project") are now "back ordered" with estimated shipping
dates of like October! Any suggestions for equal or superior parts?
Please? Does anyone have an updated "Mouser Project" that has all the
"correct" or better quality parts in stock (equal to or better quality
that spec'd)?
Here's what I've been trying to work with thanks to Bob Camp.
Unfortunately, two of the components are now not available... help???
https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=8736DCEE10
Mouser #: 271-620-RC
Metal Film Resistors - Through Hole 620ohms 1% 50PPM
Mouser #: 271-2.4K-RC
Metal Film Resistors - Through Hole 2.4Kohms 1% 50PPM
I'd like to place the complete order for all the components for my six
PICTIC II's as quickly as possiible.
Thanks,
73 Brice KA8MAV
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