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Setting up the synchro gauges

Started by kattz, May 26, 2021, 03:01:38 PM

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Can anyone here please send me the information on what I would need to set up my two gauges that use synchyos. What card to use, basically how to interface with the Sim and with the PC. I have two gauges, packs ducts and flaps.

Any and all help appreciated! Thanks.



Hi, Kevin—

I, too, am looking for interfacing options for synchros/resolvers for my B727 project and stumbled across this the other day:


It looks pretty straight forward with minimal fuss.  I'm not sure if this will help in your quest but wanted to at least get it out there!!!

Let me know if it works for you as I haven't had a chance to do anything more with my interfacing projects.

I made the decision and jumped-in with X-Plane 11 and the FlyJSim 727 and have been focusing all my attention to learning how to operate X-Plane after all those years with FS9 and FXS.  HUGE learning curve!!!



It looks like the synchro units are attached directly to the gauge and you have to move them externally using a servo card and a servo. So there's two channels of synchro, A and B, and they go to the gauge as well as the correct voltage, and you would turn the shaft on the servo on the synchro transmitter for the gauge to work. Doesn't look like other than a servo card and a servo anything else would be involved.


I'm in the same boat, also looking to drive a flaps gauge.

I've found two videos that I'm planning to investigate further to get pointers on how to drive these.





If you are building your own you could base it on a dual-shaft stepper motor from a car dashboard. Here's an illustrative link, but they are available from AliExpress and other sources:

Search for Juken x40 for more information (Juken is the original manufacturer, x40 is the dual-shaft version, but there are other versions for other applications).

The steppers are easy to drive and can be hooked up directly to Arduino output pins. If there's nothing out there already then you need a program that gets the flaps position from the simulator and runs the stepper motors in the right direction until the physical pointer matches the simulator's position.


Hi guys,
the traditional way is to connect a synchro, inside the gauge, to a synchro outside ( So the synchros are physically connected: movement in one end is detected on the other end), and physically attach then the synchro to a stepper motor that can be driven by any analog card input.
Currently, Simulator solutions from Australia are producing a card that seems to read directly the synchro and provide the 400 Hz needed by the synchro, but I just ordered the card, so I can not report yet.


Please keep us updated on the progress if you would. I think we're all probably interested in that!



June 07, 2021, 11:23:19 AM #7 Last Edit: June 07, 2021, 11:24:03 AM by AAnnillo
Yes, please update us when you've received your boards and have done your testing.  I will pull the trigger and order at least five (5) to start!

Hoping all is well.


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