Recent discussion here and on several newsgroups has discussed the type of heart rate monitor that uses a light directed through a finger or earlobe. But the majority of current commercial exercise heart rate monitors use a strap that goes across the users chest. You dampen the two pads on the strap and it picks up your heart rate, transmitting it to a display. Anyone have some thoughts on how to build one of these? Rock T _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com