How to Build an Electrocardiogram Machine (EKG) | PCB | Maker Pro
Electrocardiography for Cheap: DIY ECG Uses One LM741 Op-Amp, Five Resistors, and 'Penny Electrodes' « Adafruit Industries – Makers, hackers, artists, designers and engineers!
DIY EKG Using Arduino and Javascript - EEWeb
Home Made Electrocardiograph
DIY ECG with 1 op-amp
6. The schematic of the ECG circuit. | Download Scientific Diagram