[time-nuts] What's the latest correct PICTIC II Mouser project?- Heathkid

Heathkid heathkid at heathkid.com
Sat Aug 14 03:34:33 UTC 2010


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" <lists at rtty.us>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at 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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>
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