4ms — Rotating Clock Divider
Rotating Clock Divider Manual PDF
4ms Rotating Clock Divider (RCD) Cheat Sheet
PCB v1.2, Firmware v1.1
4HP, 60mA @ +12V/+15V
Overview
The RCD takes a master clock input and outputs 8 different clock divisions, rotatable by CV. Divisions, mode, and rotation are easily voltage- or jumper-controlled. Optionally, deep configuration is available at the back (jumpers).
Front Panel Controls & Jacks
| Label |
Type |
Function |
Voltage Range |
| Clock In |
Input |
Main clock input, rising edge triggers |
3.5V – 15V |
| CV Rotate |
Input |
Rotates output divisions per jack |
0V – +5V |
| CV Reset |
Input |
Syncs/resets count on next rising clock |
3.5V – 15V (Trig) |
| /1 ... /8 |
Output |
Divided clock outputs |
GATE: 0V/High, 50%duty
TRIG: Follows clock pw |
| LEDs |
Visual |
Show clock activity/output states |
- |
| (No knobs, sliders, or toggles on the front panel) |
|
|
|
Voltage-Controlled Inputs
- Clock In — 3.5V–15V, triggers on rising edge
- CV Rotate — 0V to +5V; each ~0.67V step (max-div 8) advances all outs by 1 division
- CV Reset — 3.5V–15V, pulse resets counters on next clock
Outputs
- 8x Divider Outs (3.5mm jacks, labeled 1–8, see below for mapping)
- Spread Off, Max Div 8: 1, 2, ... 8 (+ Rotate offset R)
- Spread On: /1, /2, /3, /4, /6, /8, /12, /16 (rotates with CV)
- GATE Mode: 0V/High, 50% duty (divided waveform)
- TRIG Mode: Short pulse equals input clock pulse width
Back Panel Jumpers (Options, or use Breakout)
| Label |
Setting |
Action/Description |
| Up/Down |
ON: Downbeat |
All outputs fire on 1st beat.
OFF: Upbeat (default) |
| Trig/Gate |
ON: Gate Mode |
50/50% gate outs.
OFF: Trigger Mode (default) |
| Max-Div-Range 16 |
ON: Max /16 |
Sets the highest division |
| Max-Div-Range 32 |
ON: Max /32 |
Used with above for /32 or /64 |
| Spread |
ON: Spread |
Evenly spreads outputs in max range |
| Auto-Reset |
ON: Enables (16/32/64/128) |
Auto-resets at end of cycle |
- Max-Div by:
- Both 16 & 32 OFF: Max /64
- 16 ON, 32 OFF: Max /16
- 16 OFF, 32 ON: Max /32
- 16 ON, 32 ON: Max /8
Reference: Output Jack Mapping (Default, Spread OFF, MaxDiv 8)
| CV Rotate Voltage |
<0.67V |
0.67–1.3V |
1.3–1.9V |
1.9–2.5V |
... up to >4.5V |
| /1 |
1 |
2 |
3 |
4 |
up to 8 |
| /2 |
2 |
3 |
4 |
... |
wraps to /1 |
| ... |
... |
... |
... |
... |
... |
| /8 |
8 |
1 |
2 |
... |
wraps to /7 |
Special Modes & Details
- Spread Mode ON: Jacks follow intervals: /1, /2, /3, /4, /6, /8, /12, /16
Good for musical/rhythmic divisions.
- Auto Reset: Automatically resets the divider count after n clocks (per jumper and Max Div).
- Bus Clock Input: Can clock from Eurorack bus (jumper); patched clock overrides bus.
- 5V/12V Power: Selectable with rear jumper ("EXT"=5V; "INT"=12V, factory default).
- LED Brightness: Rear trim pot.
Quickstart / Typical Patch
- Patch clock source into Clock In (5V square or trigger).
- Patch Divider outputs (1–8) to modules/drums/sequencers, etc.
- Apply CV to Rotate input to shift all outputs together.
- Patch Reset with a trigger or out from another divider to resync cycle.
Advanced
- Rear jumpers set gate/trigger, up/down counting, auto-reset, Spread, Max-Div range, bus clock.
- Use the RCD Breakout for easy mode changes.
Generated With Eurorack Processor