In Reply to: ecg circuit. posted by Ahmed on 10/16/02 at 7:33 AM:
The schematics (except the first one) have a persistent error in them. Input port LA is connected to the wrong node. Remove it from U2D pin 14 and connect it to the node that joins U2C pin 10, U1 pin 2, and R10. Having said that, I can't vouch for the operation of this circuit, because I have never built it, and I won't guarantee that it won't kill you if you use it.