"Dave Plowman (News)" wrote:

In article ,
Michael A. Terrell wrote:
Makes you wonder just how all the various computers in the modern car
survive...

No wondering, at all. They are designed to meet the specifications.
Believe whatever you want, but there are detailed specifications for
automotive electronics, and the required protection. G0 to the design
newsgroup and tell some of the engineers that there are no spikes, or
load dumps.

The early Delco transistor car radios had a 'Spark plate', that arced
over to damp the spikes, along with a large series inductor.

I'd guess the Delco designers knew how crap their car electrics were.
Early Blaupunkt seemed to work just fine without.


Every crappy solid state Blaupunkt I worked on had similar
protection. They were the lowest grade construction of any automotive
electronics that I ever had the misfortune to repair. I repaired over
1000 car radios when I was a teenager. Delco was one of the best, as
far as durability & ease of repair. They were durable, because they were
better designed. Philco was the worst US design, followed by the
Japanese radios, then the European designs. I never saw anything from
Russia, but I've heard that they were even worse.


ignorance may be bliss, but it damages lots of equipment.

Sure it might if you're stupid enough to disconnect the battery with the
engine running.


So, you claim that batteries never fail, or battery lugs come loose?
You've never seen an open fusible link? You are just a parts changer
who doesn't understand the intimate details of a design.

http://www.google.com/search?hl=en&rls=com.microsoft%3Aen-us%3AIE-SearchBox&rlz=1I7GGLD&q=automotive+electrical+load +dump
Results 1 - 10 of about 177,000 for automotive electrical load dump.
(0.30 seconds)


It's a bit like memory effect on Ni-Cads - it can happen but is very very
rare. Doesn't stop some 'engineers' saying it happens all the time. And
others believing them.


Its nothing like Ni-Cad 'Memory effect' which was reported in some
spacecraft that had the exact same charging cycle, over and over due to
their constant orbit. The effect was proven in the lab by duplicating
the charging cycles. By varying the charge cycles that doesn't occur.


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