On Saturday 24 November 2012 21:05:58 James Boulton did opine:

> Has anyone on list used a stepper as an encoder like this:
> 
> http://home.clear.net.nz/pages/joecolquitt/stepper_as_encoder.html
> 
> James

I breadboarded a similar circuit, feeding the coils of a small 24v stepper 
into a comparator with a very slight hysteresis, perhaps 5mv of feedback so 
that stopped the status was still known. On the scope, it appeared to work 
quite well at speeds even slower than I might turn the shaft with a 2" 
spinner knob.

I was going to use it as a pendant to drive the mill, but it seems as if I 
have miss-placed my round tuit.  pcb for the lm339's and 4 motors have been 
occupying a box in the basement for about 2 years now.  I was going to 
mount them on a box so x was on the right side, y was on the front, with z 
and (a|b|c) on the top.

Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
Excellent day for drinking heavily.  Spike the office water cooler.

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