From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


The PWM controller controlled from a microprocessor will keep the torque up
will be the best thing.  Using the encoder wheel will provide feedback to
the microprocessor of how fast the motor is turning.  It will also keep
track of where the drive is if you include that part into the software. 
You can also provide a simple D/A convertor with a few outputs of the
microprocessor to do some control of the motor if you so desire so that it
can still slew at the fastest rate for moving to another object but don't
drop the voltage too low when tracking or the motor will tend to work too
hard.
Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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