Electrocardiography for Cheap: DIY ECG Uses One LM741 Op-Amp, Five Resistors, and 'Penny Electrodes' « Adafruit Industries – Makers, hackers, artists, designers and engineers!
ECG Monitoring system using AD8232 with Arduino or ESP32 IOT Based – Circuit Schools
DIY ECG With Analog Discovery Studio and LabVIEW - Digilent Reference
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