> I'd love to see some good data on component aging.

I have some recent experience with this question.

I have a speech synthesis IC which I bought in 1981. It has since been
obsoleted by the manufacturer. I pulled it out of my storage box this week
after it literally sat for 15+ years since it last had power on it. After
rebuilding the same circuit which was used back in 1986 (with the same
original components which were de-soldered) , there is no noticeable
difference in the speech quality. This device is not one of those that you
record voice and play it back, it actually has speech patterns "burnt" into
the device.

On reading Dave's posting, I went back and pulled the cassette tape I made
back in 1986 of the project. I can't notice any difference. I know this is
not a scientific study, but at least it's something to compare without
warming up the scope and making a comparison of values.


Regards,

Eric - N3VUZ
Heroes, every one of them.
http://www.lastalarm.org

At 02:59 AM 3/9/2002 +0000, you wrote:
>Bob Ammerman wrote...
>
> >To comment on my own comment...
> >
> >Although you can characterize the chips as they are right now, that may not
> >hold after they age under bias and temperature for days, months, years or
> >decades.
>
>I'd love to see some good data on component aging.  I've heard that
>components age; but other than opto stuff and aluminum electrolytic caps
>I've never encountered it--one payback, perhaps, from designing very
>conservatively.
>
>Other than EEPROM write endurance, do PICs age in any significant way?
>
>Dave D.
>
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