ECG Mk. III Part 7 - Trying to Improve Common Mode Rejection

I think I'm getting better at making these videos short. I'm not getting any better at biosensing. Annotations, for mobile viewers: 2:42 - The audio wasn't actually set up to pipe the input from the microphone out the speakers - the volume on the speakers was all the way up, and what you can hear is leakage from the input to the output in my krummy sound card. 4:49 - Maybe a static charge building up when I rub the insulation? 5:13 - Makes sense since the heart's also a muscle. The next video in the series is here:    • ECG Mk. III Part 8 - Addressing the new pr...   And the previous video, in case you missed it:    • ECG Side Experiment - Better electrodes?