<div dir="ltr">Jay, you can blow gauges that way. If the gauge is marked DC well then that's what it is!<div><br></div><div style>Enjoy</div><div style>Cris</div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Sun, Apr 7, 2013 at 9:00 PM, Joseph Fagner <span dir="ltr"><<a href="mailto:crease-guard@sbcglobal.net" target="_blank">crease-guard@sbcglobal.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>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.<br>
<br>Jay<br></div><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><br><div style="font-family:arial,helvetica,sans-serif;font-size:13px"><font face="Tahoma"><hr size="1"><b><span style="font-weight:bold">From:</span></b> "<a href="mailto:dabigboy@cox.net" target="_blank">dabigboy@cox.net</a>"
<<a href="mailto:dabigboy@cox.net" target="_blank">dabigboy@cox.net</a>><br><b><span style="font-weight:bold">To:</span></b> Simulator Cockpit Builder's List <<a href="mailto:simpits-tech@simpits.org" target="_blank">simpits-tech@simpits.org</a>><br>
<b><span style="font-weight:bold">Sent:</span></b> Sun, April 7, 2013 7:54:42 PM<br><b><span style="font-weight:bold">Subject:</span></b> [simpits-tech] Driving a 28vdc fuel indicator<br></font><div><div class="h5"><br>
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.<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 butcher the
gauge.<br><br>Matt<br><br></div></div></div></div></div></div></blockquote></div><br clear="all"><div><br></div><div style="text-align:center"><br></div><div style="padding:0px;margin-left:0px;margin-top:0px;overflow:hidden;word-wrap:break-word;color:black;font-size:10px;text-align:left;line-height:130%">
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