> But lamps are a really bad representation of a motor!  They 
> don't have the inductance, they don't generate 
> back-EMF, and when their power is shut off they don't turn 
> into generators and send voltage the wrong way into 
> the electronics (think of Fleming's two hands...).

No, but the question here was about the switching speed of the FETs, for
which inductive or reactive load will not make that much of a
difference. And to be on the safe side I used a much heavier load than
expected. (That is: at that moment :) specifications will always
change...)

> I think you need to set up a test rig with actual motors, 
> even if they don't have the actual live mechanism 
> connected, but some sort of dummy load such as a flywheel.

A flywheel is not exactly a dummy load, it does not dissipate. These
motors are geared, and the gearbox does not like begin (back-) driven.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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