Electronic music is a fascinating hobby. You learn an awful lot, you spend a fortune on components and, in the end, you get a small box that makes a wobbly noise that’s barely different from all the other circuits you’ve spent hours putting together.

Jokes aside, the learning curve for homemade analogue synths can be incredibly intimidating. So this circuit, which is priced at $9.99 on Tindie, is an inviting breath of fresh air. It’s a sawtooth organ, which uses just a handful of components to make notes when the user presses a stylus onto a keyboard. That’s it, and the simplicity means that anyone with a soldering iron will be able to put it together and bash out simple tunes