[simpits-tech] Driving a 28vdc fuel indicator

[Cris Harrison]

nope 28dc all the way have a look at this it might help
http://www.freepatentsonline.com/2195813.pdf

Enjoy
Cris H.


On Sun, Apr 7, 2013 at 9:30 PM, <dabigboy at cox.net> wrote:

> Yep, I'm used to running into the 400hz thing, but this gauge is actually
> labeled for DC. I thought maybe it was some sort of air core or variation
> thereof, but that doesn't seem to be the case.
>
> Matt
>
> ---- Joseph Fagner <crease-guard at sbcglobal.net> wrote:
> > Most of these things are 400Hz gauges since they are used in aircraft.  I
> > suspect you need 28v 400Hz.  Then you have to generate a signal and that
> has to
> > be calibrated along with feedback to know the needles position. Without
> the
> > schematic, you will need to pull everything apart and trace out the
> wires and
> > parts.  If you are going to do that, you're better off gutting it and
> going with
> > an aircore.  Or, you keep the motor and drive it with custom electronics.
> >
> > Jay
> >
> >
> >
> >
> > ________________________________
> > From: "dabigboy at cox.net" <dabigboy at cox.net>
> > To: Simulator Cockpit Builder's List <simpits-tech at simpits.org>
> > Sent: Sun, April 7, 2013 7:54:42 PM
> > Subject: [simpits-tech] Driving a 28vdc fuel indicator
> >
> > I am having a rough time with something that was supposed to be simple.
> I picked
> > up a 28v fuel indicator made by Liquidometer a while back. I can't find
> any
> > documentation for it, but putting voltage to two of its 10 pins moves the
> > needle. In fact, I can pretty well control the needle using 12v PWM (or
> variable
> > voltage, basically) on an Arduino, with a PNP transistor, up to about
> half scale
> > needle deflection. Beyond that, the needle barely moves, even with
> DOUBLE the
> > voltage (30+ volts). I tried additionally putting voltage to other pins
> (there
> > are a number of pins that will move the needle in much the same manner),
> but
> > nothing pushes it over the magic halfway'ish point.
> >
> > Any ideas? I have a gauge just like this:
> http://www.ebay.com/itm/110894737604
> >
> > I am about ready to gut it and stuff an air core motor in there, but I
> hate to
> > butcher the gauge.
> >
> > Matt
> > _______________________________________________
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> > Thanks!
>
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