> At 03:49 PM 2/28/2004 -0500, Spehro Pefhany wrote:
> Gustaf:  Connect the zener to GND rather than 5V. Other than that, it
> looks good. Why the LS244?
>

I don't understand sending the zener to ground.  If I go from 5v to
the motor commons, and then to ground, that's just a zener diode between
5v and ground. On the other hand, if you mean I should put the zener
going to ground on pin 9 (gnd pin of ULN2803) then I sort of see what
you mean.  Which is it?  By the way, the wiring I have used is based
on this wiring of a ULN2003:

http://www.doc.ic.ac.uk/~ih/doc/stepper/control2/connect.html

Is the diagram on that page incorrect?

Why the LS244...
I put the LS244 in for paranoia; I don't want to blow up my computer's
printer port.  So, I thought that I would try to not sink current from
the printer port to drive the PIC.  Of course, I don't know if it's
actually doing anything.  I used the LS244 to send data into input
pins on the parallel port on another project, to buffer the lines going
into the printer port and offer some protection to the computer from my
circuit (or something connected to it).

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