I recently started getting something related in my youtube recommendations and that is the recordings of PWM motor signals from japanese and american trains[0].

I recently started getting something related in my youtube recommendations and that is the recordings of PWM motor signals from japanese and american trains[0]. There's also people building their own boards and motors to generate these same waveforms[1]. [0]: https://www.youtube.com/watch?v=mgxlM_kiDL0 https://www.youtube.com/watch?v=mgxlM_kiDL0 [1]: https://www.youtube.com/watch?v=i0B2bvd9rFQ https://www.youtube.com/watch?v=i0B2bvd9rFQ