I'm so excited about this I don't even know where to start... Roman Black
has donated his Linistepper kit to PICList.com to help out hobbyist builders
and to raise some money to help with the costs of the web site, etc... and
we have decided to start selling them at an introductory price of only
$30/each or 75$ for three.

This is a professional quality system at a hobby price. Check out these
features:

Full to 18th over micro stepping and linear ramping. So with a standard 200
step per revolution motor you get:
* 200 step - full step
* 400 step - high-torque half step (EXCUSIVE FEATURE)
* 1200 step - micro step 6th!
* 3600 step - micro step 18th!
* ???? step - Linear ramping STEPLESS (EXCLUSIVE FEATURE)

Special modes (hard to find in any other controller):
* Special high-torque half-stepping mode
http://www.piclist.com/io/stepper/linistep/halfstep
* Linear ramping stepless modes
http://www.piclist.com/io/stepper/linistep/lini_wks.htm#Ramping
* low power "hold" mode and change modes on the FLY!
http://www.piclist.com/io/stepper/linistep/lini_use#changemode

Other Features:
* On-board PIC chip + free source code (OPEN SOURCE) and the circuit is on
the site as well, so you can make your own if you have the parts in stock
and can make your own PCB. The kit price is so good I don't think it will be
worth it for most.
* Rugged 5A 100v transistors. Best suited for up to 1.5A /phase motors (Up
to 2.5A/phase with some changes)
* 72mm x 50mm board size. Heat sinks will be required for operation.
* PSU voltage 4v to 35v. Requires motor voltage and regulated +5v
* Constant current linear unipolar STEPLESS OPERATION, linear current
smoothing. Motors run cooler and can be smooth even at very low speeds.
* "standard" step + direction inputs, in addition to mode and high/low
power.

Please note: UNIPOLAR motors only (needs a 5,6 or 8 wire motor): Bipolar (4
wire) motors are NOT supported. And because it is a linear and not a
chopper, the motor will run cooler but BIG heat sinks will be required on
the controller for high power operation.  Yes, some people want chopper vs.
linear and some people need bipolar support. Look elsewhere. This isn't
that.

Roman has completely documented the theory of operation and design tradeoffs
so it is easy to understand an make changes to fine tune the unit to your
needs:
http://www.piclist.com/io/stepper/linistep/lini_wks
All PIC source code is provided, suits 16F84 and 16F628 (the 16F628 /20mHz
chip is supplied ALREADY PROGRAMMED with the kit)!

And his "how to use it" page is so good, it is going to help a lot of people
make use of steppers whether they get this kit or not.
http://www.piclist.com/io/stepper/linistep/lini_use

Pat Roman on the back for this nice design and for contributing so much to
support our list.

---
James Newton, webhost piclist.com (former Admin #3)
jamesnewton@piclist.com 1-619-652-0593 fax:1-208-279-8767
PIC/PICList FAQ: http://www.piclist.com or .org

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