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From: "Tarver Engineering"
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <_F1l9.30$VI5.email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
Subject: Re: (Avionics) How can this circuit produce an "inductive surge"?
Date: Sat, 28 Sep 2002 10:12:12 -0700
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Peter Gottlieb" wrote in message
> "Tarver Engineering" wrote in message
> > > You were talking about small reverse transients frying things. But
> > > spikes shouldn't get in beyond the power supply, which should
> > > protected from them.
> > That is a poor assumption to make.
> Oh, I thought you were designing the power supply and/or protection. Is
> adequate protection still a poor assumption to make? I'm not really sure
> where you're coming from here.
The airplane is already designed and built.
For the power supplies I design the input to, the transients are supressed.
> > > Which Vcc are you talking about? For the logic/analog chips? Or the
> > power
> > > supply input?
> > Power supply input.
> I would think an isolated power supply would give the best protection.
> way it only cares about the input bus voltage and not noise between either
> or - lead and ground. Proper design would survive the environment
> for (you mentioned some spec), whether this included 600 Volt spikes,
> reverse polarity, or whatever.
Sure, but you can't know that for an existing airplane.
In fact, the manufacturer seems to disagree with you.
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