> Joe, have you tried (except good ground layout) a low ESR > capacitor mounted near the relay coil (I mean VERY close to > the coil) between the +supply and ground Hi Vasile, no I've not heard of doing that. I've got a couple of relay boards to work on shortly (presently not having problems with the prototypes) and will see what effect such a capacitor has on ground noise -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist