> Wouter, we have talk about this several times on this list 
> and on others.
> 1N5819 has only 40V breakdown voltage. It's less than 2x24V requested
> by any engineering design requirements. 

you might have a point here 

> Also the motor load is 5A,

no, the power supply is 5A, the *stall* current of this motor (there is
a heavier motor too, this is the smaller one) is only 300 mA.

> while your maximum supressed current is 1A (25A/8mS maximum maximum
> peak current).
> Change diode with at least 100V one and check if your maximum peak
> current through diodes tooks more than 2-3mS. If yes, choose a 2A
> diode.

which diode would you suggest for 2A/100V?

I think your points are probably valid, but not the root cause of this
problem. The circuit contains two H-bridges, and this problem occured in
one leg of the H bridge for the smaller motor!

Oh, and you are quick responder: I don't even see my original question
on the list :)

Wouter van Ooijen

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