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simple & cheap ECG with arduino / EKG mit Arduino - YouTube
6. The schematic of the ECG circuit. | Download Scientific Diagram
Electrocardiography for Cheap: DIY ECG Uses One LM741 Op-Amp, Five Resistors, and 'Penny Electrodes' « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Check Your Heart Condition Under 10$ || DIY Homemade ECG Machine using AD8232 - YouTube
DIY ECG circuit - CircuitLab
ECG Project With All The Messy Safety Details | Hackaday