After a bracket is connected the drawer slide and the belt, you’ve got a very inexpensive linear motor. In our days of dumpster diving, we can’t count the number of times we’ve passed up on ...

Figure 2 Varying the reference voltage instead of the R-C time-constant gives a tuning law that is close enough to being linear in pitch over a couple of octaves, especially after adding R2. Just as ...

To drive the coils, he used a pair of TB6612FNG stepper motor drivers, controlled by a Wemos D1 Mini. The housing was 3D printed mostly from PLA, but with a few bits done in PETG. This was for ...

But a secondary purpose should be to push things as far as possible, while having fun experimenting! Given a pitch-linear tone source, it seemed silly not to try make some kind of musical thingy using ...