<div dir="ltr">nope 28dc all the way have a look at this it might help<div><a href="http://www.freepatentsonline.com/2195813.pdf">http://www.freepatentsonline.com/2195813.pdf</a><br></div><div><br></div><div style>Enjoy</div>
<div style>Cris H.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Apr 7, 2013 at 9:30 PM, <span dir="ltr"><<a href="mailto:dabigboy@cox.net" target="_blank">dabigboy@cox.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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.<br>
<span class="HOEnZb"><font color="#888888"><br>
Matt<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
---- Joseph Fagner <<a href="mailto:crease-guard@sbcglobal.net">crease-guard@sbcglobal.net</a>> wrote:<br>
> Most of these things are 400Hz gauges since they are used in aircraft. I<br>
> suspect you need 28v 400Hz. Then you have to generate a signal and that has to<br>
> be calibrated along with feedback to know the needles position. Without the<br>
> schematic, you will need to pull everything apart and trace out the wires and<br>
> parts. If you are going to do that, you're better off gutting it and going with<br>
> an aircore. Or, you keep the motor and drive it with custom electronics.<br>
><br>
> Jay<br>
><br>
><br>
><br>
><br>
> ________________________________<br>
> From: "<a href="mailto:dabigboy@cox.net">dabigboy@cox.net</a>" <<a href="mailto:dabigboy@cox.net">dabigboy@cox.net</a>><br>
> To: Simulator Cockpit Builder's List <<a href="mailto:simpits-tech@simpits.org">simpits-tech@simpits.org</a>><br>
> Sent: Sun, April 7, 2013 7:54:42 PM<br>
> Subject: [simpits-tech] Driving a 28vdc fuel indicator<br>
><br>
> I am having a rough time with something that was supposed to be simple. I picked<br>
> up a 28v fuel indicator made by Liquidometer a while back. I can't find any<br>
> documentation for it, but putting voltage to two of its 10 pins moves the<br>
> needle. In fact, I can pretty well control the needle using 12v PWM (or variable<br>
> voltage, basically) on an Arduino, with a PNP transistor, up to about half scale<br>
> needle deflection. Beyond that, the needle barely moves, even with DOUBLE the<br>
> voltage (30+ volts). I tried additionally putting voltage to other pins (there<br>
> are a number of pins that will move the needle in much the same manner), but<br>
> nothing pushes it over the magic halfway'ish point.<br>
><br>
> Any ideas? I have a gauge just like this: <a href="http://www.ebay.com/itm/110894737604" target="_blank">http://www.ebay.com/itm/110894737604</a><br>
><br>
> I am about ready to gut it and stuff an air core motor in there, but I hate to<br>
> butcher the gauge.<br>
><br>
> Matt<br>
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