Re: emc help

Hello
Thanks for assuming i designed the power supply.
It was the pc's power supply that overvolted
And since the galil 1040 board happens to be an isa board the
expected happened.
The main reason this all happened is the that the 480 volts to the
building resides at about 520 volt or so

Regards,
Greg

-- In CAD_CAM_EDM_DRO@yahoogroups.com, "Roy J. Tellason"
<rtellason@b...> wrote:

> On Saturday 31 January 2004 01:46 pm, Greg wrote:
>
> > I have a lot of these boards in the field and have only had one go
> > bad (power supply overvolted)even when they are in some really bad
> > enviroments.
>
> It amazes me that so many designers of this stuff don't seem to

know about the

> concept of a crowbar circuit to protect load in such an

eventuality. I've

> seen too many huge piles of industrial machinery brought to a

complete halt

> by this omission...
>
> I know this isn't strictly topical, but if any of you guys want to

know how

> to build a crowbar circuit, I'll be happy to explain it if you

contact me

> off-list.