για οσους ασχολουνται με το σπορ... 
http://focus.ti.com/lit/an/sboa092a/sboa092a.pdf
http://focus.ti.com/lit/ml/sloa088/sloa088.pdf
http://focus.ti.com/lit/an/slod006b/slod006b.pdf
http://focus.ti.com/lit/an/sboa092a/sboa092a.pdf
http://focus.ti.com/lit/ml/sloa088/sloa088.pdf
http://focus.ti.com/lit/an/slod006b/slod006b.pdf
