EDGES /quad chiptune generator

Github - BOM

Features

3 Square/pulse generators

• Aliasing-free digital synthesis, based on a 4 MHz digital timer.
• 5 preset duty cycles settings, from 50% to 95%, or CV-controlled PWM.

1 Noise and triangle generator

• 48kHz, 12-bit DAC without reconstruction filter for a raw sound.
• Triangle, bitcrushed sine, steppy NES triangle or various flavours of LSFR noise.

Advanced features

• Optional semitone quantizer on the pitch CV input.
• Per-channel mini step sequencer (8 steps) – perfect for creating rapid fire arpeggios. When the sequencer is active, the GATE input works instead as a CLOCK input.

Specifications

• Input impedances: 100k.
• CV acquisition: 4kHz, 12-bit.
• Channel 1 to 3: 4MHz, 1-bit.
• Channel 4: 48kHz, 12-bit.

Code (AVR projects): GPL3.0.

Code (STM32F projects): MIT license.

Hardware: cc-by-sa-3.0

By: Emilie Gillet (emilie.o.gillet@gmail.com)