[TowerTalk] synchro to RS232

[jimlux]

Just how common are synchro/selsyns in ham applications..

I'd be willing to do a Arduino thing that can read one and generate USB 
serial/RS232 output or a display.

I think I gave away my box of motors to some ambitious soul - Does 
anyone know of a place to get a cheap, representative example of the 
sending end?  Anything less than $50 is fine.

A 400 Hz size 19 or 23 would be just fine.