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to Princeton: As I understand it, you don't need the diodes if you are using a resistive load such as a light bulb; but when using a large inductive load such as a big motor, you need the diodes. As Paul says, it's like a water hammer... when the mosfets shut off, there is a large spike/lump of current that wants to keep going, and the diodes let it loop back to the motor instead of pounding through your mosfets.
Paul, if this is not right, please correct me!
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