A few years ago, [Frédéric]’s brother in law wanted a guitar tuner for Christmas. Instead of going out and buying one, [Frédéric] broke out the soldering iron and built one from scratch ...

Let’s design a guitar tuner. First up, you’ll need a 1/4″ input, and some op-amps to get that signal into a microcontroller. In the microcontroller, you’re going to be doing some FFT.

Katana-Mini X builds on the features of Katana-Mini with six versatile analog sound options, two simultaneous effects and a robust cabinet for a bigger and fuller guitar experience.