Skip to content

Playable effects modeled on the Teenage Engineering Pocket operator series. Featuring Teensy 4 for audio processing.

Notifications You must be signed in to change notification settings

mattvenn/teensy-audio-fx

Repository files navigation

Teensy FX

Hardware

board

schematic

gerbers

photos

noise performance

Buy the right parts through the links on the kitspace page.

Hardware Resources

Based off the teensy 4 audio board and the teensy beats shield

Hardware V1: git commit 99c1038

check the git repo out to the hash to make sure everything is in sync.

Errata

  • Do not place C16
  • Swap LRCLK & BCLK - see pic lrclk-bclk-swap
  • 2.2uF ceramics sound as good and are much cheaper than the 1uF acrylics for C8, C9, C14 & C15

Hardware V2: git master

  • test points for mic input
  • separate regulator for pot 3.3v to reduce noise?
  • put leds and buttons below pots for easier viewing and pressing
  • leave space on back for rubber feet
  • update FP of audio sockets to new FP - audio sockets weren't available in EU, changed to 35RASMT2BHNTRX which has 5 pads but will fit on the same fp
  • filter behind pot mux was a mistake. filters must be in front of mux or removed - fixed by removing
  • fix LRCLK & BCLK mixup - fixed

Back graphic

  • Art by Kipling: http://bit.ly/39Wxc4R. Designed in ContextFree
  • 100 x 60mm == 3.94 x 2.36" == 1182 x 708 pix

FW

  • each knob controls one of the parameters
  • each knob has a number of steps of recordable automation
  • knob's leds brightness shows current value of parameter
  • record time is based on bpm tap tempo and number of steps (4 bars in control.py)
  • buttons are: tap tempo/sync, write, erase and start automation loop from beginning
  • press & hold tempo button to switch between tap tempo and PO sync mode
  • press write and move a knob to record its movement
  • moving a knob without pressing record will wipe the pattern and set it all to the current knob value
  • 4 leds on top right show progression through the automation loop

Uploading

Then:

make prog

issues

  • freeverb noise issue fixed here
    • to fix this you can copy the local effect_freeverb over the one in ~/.platformio
  • if delay is not as long as expected (should be seconds), check teensy audio lib is up to date, older versions didn't support teensy4's large memory

Audio patch

made with https://www.pjrc.com/teensy/gui/index.html

patch

Software

control.py is a PyQT program that was developed in order to make an MVP interface that could later be translated to hardware in the form of a PCB.

gui

About

Playable effects modeled on the Teenage Engineering Pocket operator series. Featuring Teensy 4 for audio processing.

Resources

Stars

Watchers

Forks

Releases

No releases published

Packages

No packages published