After learning a lot about the design and fabrication of PCBs, I designed, fabricated, and assembled BioAmp v1 at Upside Down Labs.

It was an open hardware board that can amplify biological signals and can be used for sampling bio-potential signals like EEG, ECG, EKG, and EMG. You can use the included recorder cable for recording the signal on a pc using Audacity or on mobile using Backyard Brain's spike recorder app. The other cable with male headers, which I will call the Tinker cable, you can use for connecting the board's output to a breadboard for amplification and filtering, or you can connect it directly to Arduino.

I finally published it on the Tindie store though the PCBs were crappy and designed at home. I knew there is a lot of room for improvement but this was the best I could have done with the limited resources available at home.