> I would like to put the diode at both places, but the external relay
> comes in a module by itself with it's mounting bracket. One the other
> hand, would it be sufficient enough to put a diode at the relay end
> only and remove the one at the board?

Probably, since most of the inductance comes from the relay coil.  But I
still think its better to put a diode at both ends if the relay and driver
are separated by some distance (not on the same PC board, for example).  A
diode costs a small fraction of a relay, so I don't see the problem.


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