|Holger Wirtz 17ef5f8fa1||1 year ago|
|Case_Panel||1 year ago|
|BOM-1.7.ods||1 year ago|
|BOM-1.7.pdf||1 year ago|
|Build-Manual.odt||1 year ago|
|Build-Manual.pdf||1 year ago|
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|README.md||1 year ago|
|T3.6_SGTL5000_PT8211.odg||1 year ago|
|T3.6_SGTL5000_PT8211.pdf||1 year ago|
|Teensy-MIDI-Audio-1.7_top.odg||1 year ago|
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|Teensy-MIDI-Audio-1.7_top_Connectors.odg||1 year ago|
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|TeensyMIDIAudio.net||1 year ago|
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|TeensyMIDIAudio.pdf||1 year ago|
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|sym-lib-table||1 year ago|
A simple (modular) PCB for using a Teensy-3.6 (or 3.5) for making music.
This PCB is a summary of several circuits for the Teensy. It adds the following features to one board:
You need not equip all parts if you don't want to use all the features.
This is my first creation of a complex board and my first time using KICAD (http://kicad-pcb.org/). I created this PCB for having a flexible microcontroller-synth-plattform. The first implementation for this is a port of the DX-7 emulation of Dexed called MicroDexed (https://about.teahub.io/dcoredump/MicroDexed). First I used a stripe board as a prototype and stackable connectors for the Teensy-3.6 and the Teensy-Audio-Board. After trying around I found out that a simple LCD display and an encoder would be helpful to change banks and sounds. So I decided to create a better plattform for this and created a flexible PCB.
The same PCB should make availabe a cheap and simple or more complex construction on top of the same hardware base. So you have the option to simply use the PT8211 (with only audio outputs) and the onboard USB-MIDI as base for a synth or a full armed version with DIN-MIDI, encoders, LCD display and Audio input and output.
You can build MIDI playable synths, effects or just sound generators - it's your part to decide what to do. For this the Teensy is really a very good platform. You can use the Arduino-IDE and several very good libraries especially for the audio stacks. Also there are many third party libraries for nearly every hardware which exists - or you can decide to write your own library.
The size of the board is for using it inside a Rittal CMC-TC case. I have lots of them which can be recycled as cases for this project.
You can choose which parts you need for the thing your board should do. The board is kind of modular, so there are only some parts you need every time:
(A Teensy-3.5 also works, but you don't have the option for USB-MIDI and it has less CPU power!)
Now you can add optional parts which fit your personal design best:
Due to a modular layout there are several combinations you can choose from for best fitting your project. You have to keep in mind that you can only use one audio board at a time. So you can add a Teensy-Audio-Board (F) and a PT8211 (G) at the same time, but you have to choose which one is running with the jumpers JP1, JP2 and JP3. If the jumpers are located towards the audio out RCA-connectors, the PT8211 is enabled. Otherwise (JP3 is located towards the PT8211 and JP1, JP2 are open) the Teensy-Audio-Board is used.
The normal combination of modules for MicroDexed are the following:
Combination as audio effect:
Simple and “cheap” sound generator/synth:
There are much more combinations available. You can also add some pin-headers if you additionaly want to connect digital and/or analog I/O. All unused pins of the Teensy are routet towards the headers. The analog pins can also be used for digital I/O. The reference for the pin numbers is the electric circuit schematic (https://about.teahub.io/dcoredump/TeensyMIDIAudio/raw/branch/master/Rev-1.7/TeensyMIDIAudio.pdf).
Some more hints:
This is a (not yet complete) list of distributors where I bought my parts:
A big thanks for all who made Teensy and the software around working. Especially the guys from the forum, which are very helpful and have patience with persons who start with hardware and microcontroller business.
Also a big thanks for the KICAD guys - this software is really awesome.
And not to forget the Arduino guys - IMHO they are some of the founders of the idea of making “things” with microcontrollrs easier.
And, of course all Open-Source developers who let us take part of their work by opening their code as free software.