401 VCO
Voltage‑Controlled Oscillator
CA$300.00
The 401 VCO is a precision analog oscillator built around a temperature‑stable exponential converter and a high‑headroom triangle/saw core. It provides four simultaneous waveforms, clean tracking, FM response, and reliable sync behavior. Form factor of the unit is compact and can be powered from any standard Eurorack-format power supply.
Voltage Control (4 Inputs)
1V/Oct Input — precision 1 volt-per-octave input
FM Input — expressive modulation
PWM CV Input — modulates pulse width for animation and timbral movement
Sync Input — hard resets for harmonically locked or aggressive sync
Waveforms (4 Outputs)
All waveforms are generated simultaneously and buffered for consistent levels:
Sine — low‑distortion sine, waveshaped from the triangle core
Triangle — smooth, stable triangle, ideal for FM
Saw — harmonically rich saw, classic analog spectrum
Sub‑Oscillator — divided‑by‑2 square wave for weight and depth
Each waveform is available on its own dedicated output jack.
Front‑Panel Controls
Coarse Tune — wide‑range pitch setting
Fine Tune — micro‑adjustments for accurate tuning
FM Amount — manual FM control
PWM Amount — manual pulse‑width control
Polarity Switch — flips phase of all waveforms by 180°
Core Architecture
Temperature‑compensated exponential converter
High‑headroom triangle/saw core
Comparator‑based square generation
Triangle‑to‑sine waveshaper
Pulse‑width comparator with manual + CV offset
Sub‑oscillator (divide‑by‑2)
Buffered outputs for consistent levels across patch loads
Global polarity stage for 0°/180° phase switching
This architecture ensures stable tuning, low noise, and musical response across the full audio range.
LED Indicator
A signal LED for monitoring signal rate. The LED is driven from the core for consistent brightness and minimal noise injection to active signals.
Mechanical Specifications
Panel width: 10HP (50.5mm)
Panel height: 128.5 mm (3U) Eurorack standard
Mounting: 2× M3 holes (3.2mm clearance) Eurorack standard
Depth: compatible with skiff‑friendly cases
Power
Standard Eurorack 10‑pin power header
+12 V / −12 V rails
Reverse‑polarity protection on the core
Low‑noise linear architecture
*This is a preorder item
*Release of the 401 VCO is planned for Spring 2026 for general availability
