Digital Stethoscope
This is a digital stethoscope that displays your heartbeat on any television. It also calculates beats per minute and alerts you if your rate falls out of a specified range.The first part of the stethoscope is the acquisition unit, which consists of an actual stethoscope mated with a microphone, and an amplifier circuit.
Digital Stethoscope

   Digital Stethoscope
Go to Digital Stethoscope website
instruct1.cit.cornell.edu