6. The schematic of the ECG circuit. | Download Scientific Diagram
DIY ECG Machine On The Cheap
Electrocardiography for Cheap: DIY ECG Uses One LM741 Op-Amp, Five Resistors, and 'Penny Electrodes' « Adafruit Industries – Makers, hackers, artists, designers and engineers!
DIY Propeller-based ECG | Hackaday
Build Your Own ECG-EKG Unit | Nuts & Volts Magazine