Loopy (LP8+) is an 8 loops programmable audio switcher controllable either using the built-in foot switches or with MIDI.

I started developing Loopy in the spring of 2020, during the first UK lockdown. It was strongly inspired by the Super8 of BYOC (a discontinued project as far as I know) and aimed to be a super-compact programmable audio switcher built around readily available components.

My main target was to design something that was easy to build for even a newbie DIY-er, with mainstream components and only round holes. At the heart of the project I have put the atmega328(p) micro controller, famous for powering the Arduino UNO, and hence widely available on eBay and many hobbyist stores. I have then decided to use a pair of 74HC595 to expand 3 pins from the uC into 16 pins, enough to control either all the relays + all the status LEDs. The rest of the components are a bunch of transistor, LED and resistors.

I have also uploaded a few videos on YouTube to show how it works in real life. Check the main intro video below and browse my account for more videos:

I am quite happy with the outcome of this project and I decided to develop it further, providing guides, BOM, drilling template and schematic online. Everything is published on the Loopy GitHub Page.

I usually have PCB and microcontrollers available (that I can pre-burnt): ping me if you want one.

Journey of a Tremulus Lune build

A couple of years ago I have started playing around with Eagle PCB, after haven’t built something for many years (I will write more about the other projects I have developed in other posts).
After working on a few overdrive, I decided to work on a modulation: I had a spare 14mm clear shaft alpha pot which I thought I could use to do a cool rate speed control. I decided then for a Tremulus Lune. As you can see from the photo below, my initial PCB layout was using the 14mm pot, but then I realised that the footprint was actually quite big, and decided to go for the 9mm one, moving the rate speed LED on the side of the control.

Schematic of the Tremulus Lune is actually quite simple, despite the size of the original PCB (why did they make it so big?). My layout is a simple 3+3, adding both LED (rate speed and on/off) to the board.
In terms of component, as well as the 9mm alpha pot, I decided to replace the VTL5C1/2 with the Silonex NSL-32, a cheaper alternative. The rest of the components are quite standard. 
I have uploaded a few pictures: they show my journey from inception to completion. It was a fun project to work on, and I am already looking forward to start working on my next project.