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eurorack digital audio-module prototyping dev-kit ]]>//gitter.im/newdigate/teensy-eurorack]]>

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

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 ]]>pjrc forum]]> * cortex m7 microcontroller (teensy 4.0) interfacing the follow components * audio: multi-channel audio codec ( 6-in / 8-out 24-bit sound card - ]]>CS42448]]> ) * analog ins/outs: -10V to 10V 16bit/sample control voltage 4 x inputs and 4 x outputs ( ]]>ad7606]]>, ]]>ad5754]]> ) * 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 (]]>plus teensy audio library]]>)

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

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 ]]>Nic N on youtube]]> & ]]>DIY Audio Electronics Maker]]> * 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

videos

]]> Eurorack digital audio modules powered by teensy micro-controller]]>

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