> If you are right -> the maximum current in each winding must be
> 0.5A -> the overall resistance of each coil must be 12V/0.5A =
> 24 Ohm (aprox). If the resistance of each coil is 4 Ohm this means
> that I must add 20 Ohms in each coil ? If I do so, each resistance will
> have to dissipate i**2*R = 0.5**2*20 = 5W !!!!!
> I am affraid that I will need more space for the 3 resistors than for
> the rest of circuit :-(
>
> Joan
>
Actually you only need one resistor in the common wire. Also note that you
have 7 drivers available of which you are using only 3 and you are allowed
to parallel the drivers for increased current drive capability. So pair the
drivers, this will give you 1 Amp per coil.

Not exactly, you must derate the current because of thermal dissipation
limitations. Look at the Data Sheets

Regards

Chris

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