Please get rid of your reply address so that a default reply goes to the
list instead of just you.

> I understand the need for a flyback diode.  However, how does a
> flyback diode protect against a reversible motor?  I understand how a
> flyback diode protects from a "forward to reverse" transition, but not
> from a "reverse to forward" transition.

You can't put a flyback diode directly accross a DC motor if it is going to
be run in both directions.  You need reverse diodes from each side of the
motor to ground and power.  Since these would be reverse accross each of the
4 FETs in the H bridge, the FET body diodes should suffice to keep the H
bridge safe.

Unfortunately this not physically right at the motor, so you may want a
snubber at the motor too.


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