[time-nuts] OT - DC-10 gyros

Bill Ezell wje at quackers.net
Thu Mar 28 07:18:41 EDT 2013

It's almost certainly part of the flight stability / autopilot system, 
as suggested privately by another time-nut.
The gyros spin up nicely and run quietly, so sounds like the bearings 
are fine.

I was using an old Yamaha amplifier I had around for the 400Hz drive. I 
think I'm going to go the audio amp route. The biggest problem I'm 
having with replacing it is that I haven't found a small amp yet that 
has enough output voltage. I'm going to breadboard up something tonight 
- simple phase-shift oscillator driving a pair of FETs in class B 
configuration with a low-pass filter to clean things up. It actually 
doesn't have to be all that clean. The gyros are electromechanical 
devices after all, they're just little split-phase AC motors.

As for what I'm going to do with it, why, the same thing we do with our 
time and frequency related projects - play with it. :) My goal is to get 
the electronics package fully functional. Fortunately, everything is 
analog using transistors you can actually see and quad 741 op-amps in 
real dip packages, and even better, only double-sided pc boards.

On 03/27/2013 11:16 PM, time-nuts-request at febo.com wrote:
> Is this part of an HSI (horizontal situation indicator), ADI (attitude
> director indicator), INS (inertial navigation system), or autopilot?  Are
> the bearings dust?
> Sounds like fun to play with though.  What do you plan to do with it?

Bill Ezell
They said 'Windows or better'
so I used Linux.

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