At 10:26 PM 1/11/99 +0100, you wrote:
>Do you think MOSFETs or FETs would be a better solution to get noise
>inmunity?
>
>Jaume.


Huh???

For one, FETS refers to mosfets, igfets, jfets, hexfets, ........

Mosfets are perfectly good relay drivers in general. I can't tell wether
you want them to be immune from noise, or you think that they create
noise??  There is an impulse when you turn off the relay coil, but you can
handle that in hardware, either with a snubber, or by turning the FET off
slowly. It's the attempt to instantaneously stop the current through an
inductor that gets you into trouble there.