A-110-4 Quadrature VCO

Doepfer A-110-4 Quadrature VCO – Phase-shifted analog sine powerhouse

The A-110-4 is a precision analog quadrature VCO that outputs four sine waves, each 90° out of phase: 0°, 90°, 180°, and 270°. This makes it an ideal module for complex stereo modulation, phase-shifting effects, and frequency modulation synthesis.

It features both exponential and linear FM inputs, PWM, and CV control, delivering clean and consistent sine waves with rock-solid tuning stability. Perfect for advanced patching techniques, or as a hi-fi LFO when needed.

Key Features:

• Four sine outputs: 0°, 90°, 180°, 270°

• Analog design with stable pitch tracking

• Linear & exponential FM inputs

• Phase-coherent modulation tool

• Compact 8HP Eurorack format

• Great for FM synthesis, stereo movement & LFO use