Upside Down Labs has this neat kit on Tindie that lets you listen to your muscles!

BioAmp v1.5 kit

BioAmp v1.5 is a single chip biopotential amplifier. It can record any biopotential signal non-invasively and doesn’t require any microcontroller to sample the signal. You just plug 9v Battery to board, Electrodes to body and Audio jack to Mobile/Laptop and you are ready to record signals like EMG, ECG, EOG, and EEG. You can record the signals on a pc using audacity OR on mobile using Backyard Brain’s spike recorder app.

Ever thought about it?

Available on our @tindie storehttps://t.co/MnAbgLuzMW

Made with @kicad_pcb
Uses @TXInstruments TL074CN chip

Github: https://t.co/pYkGo2UhLq

Thanks to @oshpark for the perfect purple PCBs😍#OpenSource @hackaday @Hacksterio #hardware pic.twitter.com/IFIVtdYcdm

— Upside Down Labs (@myupsidedownlab) February 26, 2021