--- In
Homebrew_PCBs@yahoogroups.com, "crankorgan" <john@k...> wrote:
> Dave,
> When a building is struck by lightning, long runs of wires in
> the building like Alarms and Computer networks, receive an induced
> high voltage. Some circuits use a spark gap. The gap can be a
simple
> gap to ground or a solid state device. The old devices looked like
> tubes. My guess is the are spark gaps....then again they could be
> test points.
> John
I'd go for the spark gaps. there are pleanty of individual posts
lableled TP3 and such.
but it seems a strike would wipe out the whole board, even with some
drain.
Dave