If the motor you have is Unipolar (6 wires) why not ignore the centre taps
and treat it as a Bipolar. As the windings will then be effectively in
series you will have a 12 volt motor

Regards
Chris

----- Original Message -----
From: "Greg Hastings" <ghpic@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, September 30, 2000 8:39 AM
Subject: Stepping down voltate (12V -> 6V)


> I am making a stepper motor controller driven with a pic.  The motors I
have
> are .8A (7.5Ohm), 6V motors.
> I plan to use a 12V SLA battery.
>
> I am using a 7805 V. Regulator to regulate the voltage going into the PIC,
> but in addition to this im going to need 6V to drive the steppers.
>
> Whats a good way to step down the voltage to 6V.  Going through the 7805
is
> probably a bad idea because they are only rated at 1Amp, and there are
times
> when multiple coils are going to be on, which will require 1.6Amps.
>
> If my calculations are correct, whatever is stepping down the voltage will
> need to handle about 10W of power.
>
> Any ideas on what component to use?  (The smaller the better)
>
> Greg
>
>
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