README.md
eurorack digital audio-module prototyping dev-kit <![CDATA[]]><![CDATA[]]>

(work in progress) open source hardware and software for a ~~<![CDATA[]]>teensy 3.6<![CDATA[]]>~~ eurorack shield (working on updating to <![CDATA[]]>teensy 4<![CDATA[]]> )


what is it
software
support
todo
social media
videos


what is it

A set of circuits and pc-board designs integrating all the components you need for prototyping a digital audio module for eurorack

audio codec circuit originally started as a discussion on quad audio channel outputs and a pcb design integrating teensy and cs42448 from Paul Stoffregen on <![CDATA[]]>pjrc forum<![CDATA[]]>
* cortex m7 microcontroller (teensy 4.0) interfacing the follow components
  * audio: multi-channel audio codec ( 6-in / 8-out 24-bit sound card - <![CDATA[]]>CS42448<![CDATA[]]> )
  * analog ins/outs: -10V to 10V 16bit/sample control voltage 4 x inputs and 4 x outputs ( <![CDATA[]]>ad7606<![CDATA[]]>, <![CDATA[]]>ad5754<![CDATA[]]> )
  * display: ST7735 128x128 16bit-color tft display
  * breakouts: - for uSD card, USB host/device, midi in/out, 2 x teensy analog in/out (0 to 3v3 w/protection)
* 20HP aluminium panel mounted for eurorack case
* write arduino compatible c/c++ firmware & program using arduino/teensyduino (<![CDATA[]]>plus teensy audio library<![CDATA[]]>)



software


All schematics and circuit boards designed using Autodesk Eagle cad
Autodesk Fusion 360 used for mechanical layout
My free license to autodesk fusion 360 has expired
I am planning to migrate away from proprietry software and subscription licenses


circuits and pc-boards to <![CDATA[]]>Kicad<![CDATA[]]>
physical design to <![CDATA[]]>FreeCAD<![CDATA[]]>
CAM using <![CDATA[]]>opencamlib<![CDATA[]]>



support

This project is a work-in-progress!

What you can do if you like to see progress with this project?
* star this repository
* subscribe <![CDATA[]]>Nic N on youtube<![CDATA[]]> & <![CDATA[]]>DIY Audio Electronics Maker<![CDATA[]]>
* clone this repo, make improvements, commit & send pull-requests

todo


[ ] Migrate circuits and pcbs to kicad
[ ] Teensy 4.0 changes


[ ] move control-voltage adc and dacs off main-board and on to top-breakout board
[ ] reduce main board to double layer board, instead of 4-layer board
[ ] increase horizontal size from 20HP to 24HP

[ ] Breakout board for rotary encoders and pots


[x] ~~Order~~
[ ] Assemble
[ ] Certify

[ ] ~~change all 0603 resistors and caps with 0805~~
[ ] Adapt mainboard with fpc connector from new breakout board
[x] ~~Include schematics and board for uSD adapter~~
[x] ~~Isolate analog grounds~~
[ ] Vertical alignment of FPC connectors between top breakout and mainboard
[ ] Finalize circuits / boards
[ ] Testing


[x] ~~CS42448 audio codec~~
[x] ~~control voltage input~~
[x] ~~control voltage output~~
[ ] usb host/device
[ ] midi in/out
[ ] sd card extension & adapter

[ ] Document


[ ] order & build process
[ ] software process

[ ] Firmware


[ ] Sliced audio loops
[ ] Midi looping



social media


facebook:


<![CDATA[]]>Moolet<![CDATA[]]>

youtube:


<![CDATA[]]>Nic N<![CDATA[]]>
<![CDATA[]]>DIY Audio Electronics Maker<![CDATA[]]>



videos

<![CDATA[]]><![CDATA[]]>