[simpits-tech] Conversion of electrical gauges

[Joseph Fagner]

Why 400 hz only on step up/down transformers?  You can use a 60hz
transformer to step up/down 400hz power but not the other way around. Is
there a noise issue or something?  Also, what did you convert and how did
you feed it signals?  Right now I'm working on getting an F-16 fuel flow
meter working.  This baby has a built in transformer to step down 115v/400hz
to 26v/400hz.  The problem I'm having is trying to drive the synchro inside.
I really need a Digtal to synchro converter, but they seem a bit tough to
find.  Did you build a circuit that essentially converts the digital signal
to an analog one?

Jay

-----Original Message-----
From: simpits-tech-bounces at simpits.org
[mailto:simpits-tech-bounces at simpits.org] On Behalf Of
Phoenix2000 at phoenixcomm.net
Sent: Friday, April 15, 2005 8:54 AM
To: Simulator Cockpit tech list
Subject: Re: [simpits-tech] Conversion of electrical gauges

Hi Guys,
You can use the 400 Hz stuff if you just build or get your self a 400 Hz 
generator.. I hacked one together a more than a few years ago, so I dont 
have the print for it any more.. but its not hard
as you dont need  alot of power (ie Amps).
1. You need a stable 400 Hz single phase generator. DONT use 74X04 in a 
feed back loop as you will get a square wave and that wont work, It has 
to be ANALOG.
2. in the real world 26volts should work for 80/90% of your stuff.
3. to get the current go through a Audio Amp (class C or AB) you will 
have to change the output impeadance as 8 ohms will not work..
4. OR if you are lazy.....buy a cheep 400 Hz gen and drive it will 1/2 
horse motor.....
and use step up/down transformers..(400 Hz only)

Ta Da ...
Happy Landings
Cris Harrison
www.phoenixcomm.net/~phnx2000/sim
btw I will try and post an article to my site and this site when i find 
the info....

Gene Buckle wrote:

> Matt Bailey wrote:
>
>> Howdy,
>>
>>   I occasionally see stuff like electronic tachs, altimeters, etc on 
>> ebay. I know small systems instruments like EGT, oil pressure, etc as 
>> seen on light planes, typically use air core motors, but what about 
>> the big stuff (especially altimeters and other instruments with lots 
>> of travel)? Judging by the connectors on one tachometer I see, I 
>> assume it's a digital connection....sending data and not just a 
>> simple voltage or something?
>>
>>   I'm about ready to start working on some Phidgets instruments using 
>> servos, but I also want to look at other solutions (I'm still not 
>> sure what I'm going to do about the altimeter.....Pihers sound 
>> troublesome).
>
>
> Matt, you really need to buy Mike Powell's book on building sim 
> instruments.  It's a goldmine of data and it'll even solve your 
> altimeter problem.
>
> g.
>
>

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