ECG Project With All The Messy Safety Details | Hackaday
simple & cheap ECG with arduino / EKG mit Arduino - YouTube
DIY ECG with 1 op-amp
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
Build Your Own ECG-EKG Unit | Nuts & Volts Magazine
DIY ECG with AD8232 and Sound Card - YouTube
How to Build an Electrocardiogram Machine (EKG) | PCB | Maker Pro