At 08:24 PM 8/28/01 -0500, you wrote:
>Beware strobe mods, charged strobe caps can kill. Assume all strobe caps
>are charged.
>
>--
>Dave's Engineering Page: http://www.dvanhorn.org


Yes, they can. I witnessed the death of a FET h bridge via strobe once.

Setup: pic chip controlling a motor in a typical h bridge. PIC just
happened to be an EPROM variety compleat with window.

System was on and running, customer said "Looks cool, gotta get a photo for
the folks back home". He grabbed his camera, click, flash, bang, smoke jets
out, motor stops, shows over.

Seems the flash latched up the photo sensitive pic and caused just the
right outputs to go on to fire top and bottom of the h bridge simultaneously.

Tom M.

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