[simpits-tech] Hackerizing a King ADF indicator?

[Gene Buckle]

On Sun, 1 Apr 2012, dabigboy at cox.net wrote:

> Well I got brave and opened it up....there are two cylinders inside, one 
> bigger than the other, each has a bunch of wires coming out of it. I 
> google'd the part # last night and did not come up with anything, will 
> be doing some more research today. I was thinking maybe a stepper motor, 
> but would a synchro also fit this description?
>
> I suppose the compass card moves after all, since there appear to be two 
> motors/synchros/steppers/whatever inside.
>
> If it's a synchro, I'm guessing it will be much easier to just gut the 
> thing and go the stepper router, rather than trying to drive a 
> synchro.......
>
I've NEVER seen a real aircraft instrument that used a stepper.  It _may_ 
have been done, but I doubt it.

You can drive that synchro by building one of Mike Powell's Digital to 
Synchro converter boards.  He covers this in his book, Building 
Recreational Flight Simulators.  You can download board artwork for 
ExpressPCB from his website.

What would be nice is a Synchro to Digital converter so we can read 
synchro resolvers. :)

g.


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