In which I BUILD a piece of 1980s PC hardware, from scratch, for kicks. This is meant to be a tutorial as much as a demo, so if you want to skip all the assembly, go to 26:00. Apologies for the hissy audio, I was using my mic straight into my camcorder and the levels looked fine but it turns out they were really low. Whoops. https://en.wikipedia.org/wiki/Covox_S... - You can read the thin history here. It's a pretty basic electronics concept so it was bound to happen sooner or later, but I'm still stunned that it did - also stunned at how well it works.