SynthDIY

MUVCO Part 5

SynthDIY — Sat, 11 Mar 2023 19:50:21 GMT

Bach Fugue in C Minor (BWV847). Just voices 2 and 3 because I only have two VCOs built. Musically, it sounds awful because my midi translation is quantized to heck and ignores velocity. Better midi is a future project, this is just checking that I can play something that sounds musical.

MUVCO Part 4

SynthDIY — Mon, 06 Mar 2023 01:15:47 GMT

Created a second voice on the same esp32 microcontroller but simply duplicated the control circuitry and connecting to different pins. Still kind of need FM control before I can create a pcb.

Meanwhile I'm also working on reading a midi file and play two tracks as separate voices. I'll probably work on that before the FM.

MUVCO Part 3

SynthDIY — Sat, 04 Mar 2023 12:29:53 GMT

Tuned the oscillator probably as well as I can. Already had a python MIDI->CV converter running on a raspberry pi, so hooked it up to try some scales. Working on code to input with a MIDI file and play a song and also to hook up a second voice.

MUVCO Part 2

SynthDIY — Thu, 23 Feb 2023 01:13:52 GMT

The beginnings of a eurorack VCO based on an esp32 microcontroller running micropython. DAC/DDS provided by the AD9833 breakout board.

The volts/octave input is working for all three audio waveforms and multiple CV waveforms, which you can see and hear in the audio result.

It's interesting that the audio frequency varies somewhat from the CV input. This is especially noticeable with square CV. It looks like some RC time constant after my yellow probe but before the microcontroller ADC reads the value.

MUVCO Part 1

SynthDIY — Sun, 19 Feb 2023 16:36:52 GMT

The beginnings of a eurorack VCO based on an esp32 microcontroller running micropython. DAC/DDS provided by the AD9833 breakout board.

Currently only the octave and tuning knobs work. Output is sine, triangle and square.