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From: "Gary Glaenzer"
References: <3D82A9C1.EA2CF8B6@hotmail.com> <3D83FF1E.C3239EE3@hotmail.com>
Subject: Re: Overvoltage Schematic Wanted
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
NNTP-Posting-Date: Sun, 15 Sep 2002 03:40:07 GMT
Organization: MediaCom High Speed Internet
Date: Sun, 15 Sep 2002 03:40:07 GMT
if it's potted, and if you haven't un-potted it, how do you know it's not a
Zener / SCR crowbar ?
cause it sure acts like one
"Joey @hotmail.com>" <"joeyga wrote in message
> Thanks to all who have replyed to my posting about the OVP circuit but I'm
> looking for the schematic that does not use a relay and not the crowbar
> opens the breaker. The circuit is used in the older Cessna aircraft and
> in a metal cylinder. When the voltage gets to about 16V at the input the
> voltage drops to zero until reset by killing the input voltage. The third
> wire to this
> circuit is the ground wire. I know this has got to be simple but I
> seen a
> schematic anywhere yet. Please keep me in mind if you see one and many
> to all who have responded so far here. THANKS.
> Joey wrote:
> > Hello,
> > I'm looking for an overvoltage schematic that meets the following
> > criteria. If anyone
> > has one I would appreciate a copy and be willing to pay any expense if
> > necessary.
> > My email is email@example.com
> > 1. For a 12 volt circuit that would trip at about 16 volts
> > (adjustable)
> > 2. Does not use any relays
> > 3. Has three wires to device, one + in, one ground, and one + out.
> > 4. If the + in exceeds the set voltage then there is no output.
> > 5. Input must be cut off and back on to reset
> > Such a device is used on aircraft to cut off voltage to the alternator
> > should it
> > fail and normal voltage exceeded. I've seen the clam shell type and the
> > relay
> > type but never a schematic for the type I've mentioned above. ANY help
> > will be greatly appreciated. Thanks.
> > Joey
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