On Fri, 28 Jun 2002, Erik Jacobs wrote:

>> (re stepper motor for a digital knob thread)
>> I've just been playing with a 12v unipolar "surplus"
>> stepper from an old 5.25 disk drive. Connected it to
>> the CRO and used a clothes peg for an accurate "knob".
>
>Well, my questions are:
>
>A) how small can one of these be (in comparison to a rotary encoder)?

About 8mm diameter and 4mm long is the smallest in current use. Not
available as surplus though.

>B) how cheaply can one be had (in comparison to a rotary encoder)?

A surplus stepper (large) will be about $1 from surplus places. Beware
that a good quality stepper ordered from the manufacturer can cost $25++
without his even trying hard.

I think that using steppers for this is only viable because they are
available surplus for nothing.

Peter

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body