@CrossRoads, AWOL,
Thanks, Your reply were extremely helpful. It is clear for me now.
really appreciated,
@INTP, thanks for the info, it is a quite interesting fact, which I will test.
@Grumpy_Mike, just finished reading the articles which are great for my level, specially the PWM, as it mentions something interesting that I have to try, "filters". thanks
+Karma 
@all.