I have a question about the construction of stethoscope, basically stethoscope is an instrument by which one can hear his/her/others heart beats. from overview of it, I found that it consist of 2 ear piece( containing speakers ) like headphone, two wires which merge into 1, and get connected to a mic ( Peizo Crystal ) As all the external structure of stethoscope is same as headphone. Now my question is that if I buy a headphone from market, and cut its connector and repalace it with peizo crystal, do it work? or I have to use something more? i.e. Amplifier if amplifier than what type of amplifier and how can one construct it.