> David Novak wrote:
>>
>> I suspect that a half bridge solution will only allow the motors to turn
>> in
>> one direction.

A half bridge can be used to drive a DC motor in either direction, but
you need +/- power supplies, which is usually inconvenient. OTOH, it  
halves the losses in the switching elements (because the current path  
only goes through one  switch at a time), and of course it's simpler  
(if you don't count the power supply).



Best regards,
Spehro Pefhany
-- 
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