Hi Wilf;

I wrote to you about the defect in your XOR stepper
driver. After a lot of experimenting I have come up
with this version. See:
http://www.redrok.com/images/beamstepper3.gif
This version is specifically for use in solar trackers
but may have use in beamish attraction to light.

Features:
1. True 4 phase stepper drive.
( This was the problem with the XOR design.)
2. Essentially zero power consumption when not moving.

Duane

--
Home of the $35 LED solar tracker.
http://www.redrok.com/electron.htm#led3
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