[simpits-tech] Controlling synchros

[Simon Bennett]

The indicator hasn't even been delivered yet, so there's not much I can do 
for now except read and plan. I'll also need to find the pinout of the ADI 
and buy an inverter so I can supply power to it.


This link is useful and fascinating:
http://www.tpub.com/content/neets/14187/


Right now I have other stuff to work on, though. Right now my cockpit, 
besides my HOTAS setup, consists of a small white cardboard box (the kind an 
OEM video card comes in). The box has holes in it, through which cheap Radio 
Shack toggle switches have been inserted. Also inside the box is the circuit 
board I tore out of a keyboard, and a piece of perfboard that will contain 
the circuit necessary to interface said switches with said electronicky 
bits.

I have hooked each appropriate column/row lead from the keyboard controller 
up to the output and one of the inputs of an AND gate I had lying around, 
which was the easiest way I found to tell the controller a certain key has 
been pressed, with the components I have lying around right now. All I have 
to do now is figure out how to get a on/off toggle switch to work like it's 
momentary. I worked up this really poorly-done schematic to show how I plan 
on doing this:

http://i7.photobucket.com/albums/y258/_desdinova/circuit.jpg

It seems to work, but if anyone has a better way, I'd be grateful if you 
could share it.

>From: "Joseph Fagner" <falcon4 at sbcglobal.net>
>Reply-To: Simulator Cockpit tech list <simpits-tech at simpits.org>
>To: "'Simulator Cockpit tech list'" <simpits-tech at simpits.org>
>Subject: RE: [simpits-tech] Controlling synchros
>Date: Wed, 1 Jun 2005 18:03:18 -0500
>
>I'm working on a similar issue with a Fuel Flow meter from an F-16.  We had
>thought about doing that very same thing and still might.  We are looking 
>at
>our options right now.  We are also looking at building a "poor mans"
>digital to synchro converter since the real things are damn expensive.  I'm
>getting some help since that stuff is way over my head.  We are still in 
>the
>early phases of trying to come up with an affordable solution.  Keep us
>posted on what you come up with.
>
>Jay
>
>-----Original Message-----
>From: simpits-tech-bounces at simpits.org
>[mailto:simpits-tech-bounces at simpits.org] On Behalf Of Simon Bennett
>Sent: Wednesday, June 01, 2005 5:17 PM
>To: simpits-tech at simpits.org
>Subject: [simpits-tech] Controlling synchros
>
>Since I've got a remote attitude indicator coming in the mail any day now
>(my first real aircraft instrument), I've been thinking a lot about how to
>drive it. Almost everyone seems to think driving synchros is an almost
>impossible task, but I'm not so sure. Trying to generate the signals to
>control them would definitely be a hell of a challenge, but I'm wondering,
>wouldn't it be possible, and much less frustrating, to wire the indicator
>synchro a torque transmitter, the rotor of which is controlled mechanically
>by a stepping motor or the like? I'd rather not gut the indicator if I can
>find any way to use it in its original state.
>
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