Eurorack clock module — in development
Pulser is a clock module for Eurorack systems. Its top priority is tightness: the clock must be as accurate as possible. If a groove needs to feel less mechanical, deviation can always be introduced downstream — but the foundation has to be solid. The RP2040's PIO units make this possible: pulse generation runs in dedicated hardware state machines, unaffected by what the CPU cores are doing. in development
see and hear it
facts from the build log
- Master clock for Eurorack
- Tight, PIO-based pulse generation
- BPM control via buttons
- RP2040 (Raspberry Pi Pico)
- HT16K33 display driver
- CV outputs
Final hardware specifications (panel width, power draw, I/O) will be published here once the hardware design is settled.
free & open source
Available now
- The complete development story: Pulser Building Log
- Demo video (above)
Coming as development progresses
- Firmware source code
- Schematics and PCB files (KiCad + Gerber)
- Bill of materials with sourcing notes
- Panel design and enclosure
- Step-by-step build guide
how this module is being developed
The Pulser Building Log covers the whole journey — why tightness matters, how pulse generation works on the RP2040's PIO, tempo control with a button state machine, and driving the display and CV outputs: