Gosh I hate to add more, but here it is...

Its EASY to make ONE prototype work. With a little luck, you MIGHT get two
to work. But the proof is whether you can manufacture 100 without any
fallouts.

We don't consider a design as working until 100 units pass the production
line and into the field without hands being held.

--Bob

At 03:25 PM 7/11/2003 -0400, you wrote:
>At 03:02 PM 7/11/2003 -0400, you wrote:
>
>
>>Even 10Hz circuits are really much more than 10Hz if the contain digital
>>signals.  After all, the power supply transients that the bypass caps help
>>to reduce are the result of the switching edges, not the steady state
>>between the edges.  A "10Hz" circuit may have fewer edges per second, but
>>any single edge can cause trouble without proper bypassing.
>
>I had to fix a slapdash timer design that ran at a few Hz. *Some* units
>would bang back and forth a few times at every edge and screw up the timing,
>over *some* of the temperature range. The worst kind of engineering goof-up,
>poorly designed, but it *appeared* to be okay, the guys in charge said
>"ship it" and then the returns (several percent, which was a lot of units)
>started coming in from Timbuktu and everywhere.
>
>They had a bit of warning- a 5%+ fallout rate at assembly, but didn't
>investigate it until it was too late.
>
>Best regards,
>
>Spehro Pefhany --"it's the network..."            "The Journey is the reward"
>speff@interlog.com             Info for manufacturers: http://www.trexon.com
>Embedded software/hardware/analog  Info for designers:  http://www.speff.com
>
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