GitHub - swharden/diyECG-1opAmp: A surprisingly good ECG circuit using a single op-amp and some Python software
How to Build an Electrocardiogram Machine (EKG) | PCB | Maker Pro
DIY EKG Using Arduino and Javascript - EEWeb
DIY ECG With Analog Discovery Studio and LabVIEW - Digilent Reference
ECG Monitoring system using AD8232 with Arduino or ESP32 IOT Based – Circuit Schools
Momnifique | Child life specialist, Diy doll, Child life
Electrocardiography for Cheap: DIY ECG Uses One LM741 Op-Amp, Five Resistors, and 'Penny Electrodes' « Adafruit Industries – Makers, hackers, artists, designers and engineers!