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| Re: [simpits-tech] load cell amp... [message #487 is a reply to message #486 ] |
Mon, 06 July 2009 10:04   |
 Gene Buckle
Messages: 1068
Registered: January 2009 |
Senior Member
Administrator |
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On Mon, 6 Jul 2009, Roy Coates wrote:
> On Mon, 6 Jul 2009, Gene Buckle wrote:
>
>> Roy, have you seen this:
>>
>> http://www.leobodnar.com/products/LC-amp/
>>
>> Will this work for your project?
>>
>
> Interesting - esp for the F-16 guys I suspect.
>
> I have luckily found a Hann caged-pot assembly in my "bits box" that will
> do the Eurofighter stick for me so have already progressed that route.
> That used LVDT's anyway, not load cells.
>
Ahh, ok. My understanding of what an LVDT is was faulty.
> When you see interesting toys like this you just can't help slipping off
> into fantasy land to find a project to use it with !
>
No doubt about that. :)
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://www.scarletdme.org - Get it _today_!
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| Re: [simpits-tech] load cell amp... [message #488 is a reply to message #487 ] |
Mon, 06 July 2009 10:11 |
Roy Coates
Messages: 438
Registered: January 2009 |
Senior Member |
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On Mon, 6 Jul 2009, Gene Buckle wrote:
> > I have luckily found a Hann caged-pot assembly in my "bits box" that will
> > do the Eurofighter stick for me so have already progressed that route.
> > That used LVDT's anyway, not load cells.
> >
> Ahh, ok. My understanding of what an LVDT is was faulty.
There seem to be a new breed of DC LVDT's but my understanding of the
typical setup is that you feed an AC signal into coil A, and then read
that signal back from coil B. The magnet which forms the moving part of
the device causes a phase-shift between input and output - it is this that
gives you your position, normally presented as a voltage thanks to the
clever black boxes you normally hang these things on.
Anyone know anything about the uber-sweet new hall-effect devices that can
be used as a straight swap for pots?
Hmm... toys....
--
Roy Coates.
Dept of Engineering.
Liverpool University.
E-Mail: r.coates@liv.ac.uk
Tel: 0151 794 4862
------------------------------------------------------------ -------------------
Lord, If I must have an instrument failure, please let it be the Hobbs meter.
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| Re: [simpits-tech] load cell amp... [message #489 is a reply to message #488 ] |
Mon, 06 July 2009 10:33 |
Gene Buckle
Messages: 1068
Registered: January 2009 |
Senior Member
Administrator |
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On Mon, 6 Jul 2009, Roy Coates wrote:
> There seem to be a new breed of DC LVDT's but my understanding of the
> typical setup is that you feed an AC signal into coil A, and then read
> that signal back from coil B. The magnet which forms the moving part of
> the device causes a phase-shift between input and output - it is this that
> gives you your position, normally presented as a voltage thanks to the
> clever black boxes you normally hang these things on.
>
Right. My (faulty) understand was that they were a form of load cell.
Google rapped my knuckles about that. :)
> Anyone know anything about the uber-sweet new hall-effect devices that can
> be used as a straight swap for pots?
>
They're not that new. Hall effect based replacements for pots have been
around quite a while. In Mike Powell's new book, he's got a project that
uses a device called "A1301 hall sensor". It's a three wire part, very
similar in size to a 2N2222 transistor. He uses it as a 0..5V voltage
divider. When he first posted info about it, I bought 5 of them from
DigiKey and they were less than a buck each. If you head over to his site
(http://www.mikesflightdeck.com/) and scroll down a bit (or search for
"A1301" you can see how he's using it. If you scroll to the bottom of the
page and click on the "previous rants" link you will find a little more
info on it under "Position Sensors Chapter Revisions" about the middle of
the page.
As far as I can tell, you can use these devices as a direct replacement
for a 5v based voltage dividing pot.
I know that there has been a lot of success in replacing the jitter-prone
pots in the Cougar stick with a couple of hall effect devices. I think
there is someone selling a refit kit for something like $60, but this was
some time ago.
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://www.scarletdme.org - Get it _today_!
_______________________________________________
Simpits-tech mailing list
Simpits-tech@simpits.org
http://www.simpits.org/mailman/listinfo/simpits-tech
To unsubscribe, please see the instructions at the bottom of the above page. Thanks!
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