CV-3PO
Meet CV-3PO — a hands-on, 4-channel control voltage module that puts precise analog voltage control right at your fingertips. Whether you're dialing in pitch sequences, tweaking filter sweeps, or setting up static voltages for your modular rig, four smooth slide pots give you direct, tactile control over every channel with real-time LED feedback.
But CV-3PO doesn't just set voltages — it remembers them. Hit record, move your sliders, and play back your performance on a loop. Each channel supports three switchable voltage modes (0–5V, 0–10V, and ±5V), so it fits right into whatever setup you're running. Per-channel calibration and 12-bit DAC resolution keep things tight and accurate.
Simple, playable, and built for the studio. No menus, no screens — just knobs, buttons, and volts.
Key Features
13 Voltage Modes Per Channel
Switch freely between 0–5V, 0–10V, and ±5V bipolar output on each of the four independent channels.
2Record & Playback
Capture live slider movements at 20 Hz and loop them back indefinitely, turning static voltages into evolving sequences.
312-Bit Precision, Calibrated Per Channel
The DAC and per-channel calibration tables ensure accurate, repeatable voltage output across all modes.
4No-Menu, Hands-On Control
Four slide pots, two buttons, and LED feedback. Everything is immediate — no display, no diving, no distractions.
Watch it in action
Video coming soon...
Specifications
Processing
- Processor
- ATmega4809 (@ 20 MHz)
- DAC
- MCP4728 — 4-channel, 12-bit resolution
Output
- Voltage Modes
- 0–5V unipolar, 0–10V unipolar, ±5V bipolar
- Channels
- 4 independent analog CV outputs
Interface
- Controls
- 4 slide potentiometers (10-bit ADC input)
- Buttons
- 2 tactile buttons (left/right) with debounce
- Reset
- Dedicated analog threshold reset input
- LEDs
- 6 total — 4 channel indicators (PWM) + 2 button status
System
- Switching
- 4 relay-driven digital outputs
- Connectivity
- I2C (SDA/SCL) for DAC communication
- State Storage
- EEPROM — persists channel modes across power cycles
- Recording
- 4-channel potentiometer recorder, 20 Hz sample rate (about 10 seconds in total)
- Calibration
- Per-channel, per-mode DAC margin calibration + LED brightness curve
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