[simpits-tech] Driving a 28vdc fuel indicator

[Cris Harrison]

Jay, you can blow gauges that way. If the gauge is marked DC well
then that's what it is!

Enjoy
Cris


On Sun, Apr 7, 2013 at 9:00 PM, 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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