Atari Glitch Eurorack Module

Potentiometer 100K

3.5mm mono jack PJ398SM

Mozzi

Soldering kit

arduino pro mini

<html><body><h3>Atari Glitch Synthesizer</h3>This is the VCO (voltage controlled oscillator) audio synthesizer module for the Eurorack Modular systems. It's based on the Wavetable and FM synthesis using Arduino Mozzi library. Here is the basic circuit diagram scheme of the Synthesizer: <figure><img src="https://projects.arduinocontent.cc/bb77036b-e779-418a-9a54-ae518fab317c.png"/><figcaption>circuit diagram</figcaption></figure>We have 4 main potentiometers B100K in order to set Sytentesizer's parameters:\ * Wavetable - choose a wavetable * Modulation - set modulation depth * Obertone - set amount of obertone sound * Glitch - FM operator amount The same parameters can be set using CV inputs on 3.5mm Jacks. There are several additional CV inputs: * Trigger - main gate signal (1-5V) to initiate (trigger) a note * 1V/OCT - one volt per octave - the pitch of the note to play There is one audio output, also on 3.5mm jack socket: * OUT - audio out We have also one Switch to choose the Synthesizer mode between two possible modes: * Standard FM/Wavetable synth. You can set any parameters using potentiometers or CV signals (higher priority) * Random synthesizer. In this mode, all parameters are generated randomly on each step (trigger). Potentiometers now are limiting the maximum possible value of randomly generated values. Set a potentiometer to 0 (zero) if you want to unlimit a random value range. <h3>Board</h3> The Synthesizer consists of two boards.1. The Interface board, where all potentiometers and 3.5mm jack ports are located:<figure><img src="https://projects.arduinocontent.cc/33b3b412-b587-40ac-aa27-450ff6aae7a0.png"/><figcaption>Intedrface board. KiKad 3d</figcaption></figure>2. Main logic board, where Arduino and all other discrete components are located (see the main circuit diagram for details).<figure><img src="https://projects.arduinocontent.cc/0a33326e-3b7b-4963-9150-63dfc234ba10.png"/><figcaption>Logic board. KiKad 3D</figcaption></figure>You can find all schemes and diagrams in the KiKad project files, located in the same place as a Arduino code (see github links).Here are some additional photos:<figure><img src="https://projects.arduinocontent.cc/c21cf3c6-5146-48cb-8540-e7f6b8582b34.png"/><figcaption>Logic board soldering</figcaption></figure><figure><img src="https://projects.arduinocontent.cc/ee2fff5c-194e-4d3c-b7f2-b0891ce69a16.png"/><figcaption>All three boards are connected (Interface board, logic board, and Arduino board</figcaption></figure><figure><img src="https://projects.arduinocontent.cc/a94c6c3a-25d9-42f4-a87c-b6bcbe63b897.png"/><figcaption>Bottom view</figcaption></figure><figure><img src="https://projects.arduinocontent.cc/ffb36e91-a004-465a-a4aa-32a46a7803a6.png"/><figcaption>Top view</figcaption></figure><figure><img src="https://projects.arduinocontent.cc/4b629b9c-06db-4ba9-9c44-a5ad16be0927.png"/><figcaption>Ready state</figcaption></figure><figure><img src="https://projects.arduinocontent.cc/845bffb8-c3c8-41f0-9485-4c427bae3eff.png"/><figcaption>Main view</figcaption></figure><figure><iframe src="https://www.youtube.com/watch?v=aY03wGdam5E"></iframe></figure>Sound demo. </body></html>

Atari Glitch Eurorack Module

Arduino-based Wavetable FM synthesizer