Hello all, I wanted to share this PCB I just designed for a guitar amplifier. This board houses the circuitry for three main features of the amp: digital reverb, switchable effects loop, and a buffered line out.
I have incorporated an Arduino Micro into the board to handle a few different functions. The Micro is used to toggle between reverb presets in the DSP, as well as turning the reverb off (via a relay). This is controlled from the front panel of the amplifier. It is also used to switch the effects loop in and out of the circuit via the second relay. The way this works is when a cable is plugged into the "send" jack of the effects loop, the loop is turned on. I'm also utilizing the 3.3v regulator to power an indicator LED. :)
I'm pretty new to Arduino, having just started with it in the past month. I'm loving the platform!