EM-302 | Four-Quadrant Multiplier / Balanced Modulator

RINGO is a compact, fully analog four-quadrant multiplier designed for balanced modulation, complex spectral transformation, and continuous voltage-domain computation.

At its core, RINGO performs true analog multiplication between Program and Carrier signals, generating sum-and-difference frequencies, metallic sidebands, and evolving harmonic structures. Independent bipolar attenuverters provide precise control over signal amplitude and polarity, while the G-Variable introduces an adjustable bias for shifting the multiplier's operating point.

Selectable AC/DC coupling extends its functionality beyond conventional ring modulation. In AC mode, RINGO produces classic balanced modulation effects, from subtle tremolo-like interactions to dense, inharmonic textures. In DC mode, it operates as an analog computation processor, enabling bipolar VCA operation, voltage-controlled inversion, and signal multiplication across the audio and control-voltage domains.

Illuminated Σ / Δ indicators reference the sum-and-difference relationships fundamental to balanced modulation.

01 / MULTIPLIER ARCHITECTURE

True analog four-quadrant multiplication
Balanced ring modulation and complex sideband generation

02 / SIGNAL & VOLTAGE CONTROL

Independent bipolar Program and Carrier attenuverters
G-Variable bias control
Selectable AC/DC coupling
Bipolar VCA, voltage inversion, and CV processing

03 / VISUAL INDICATION

Illuminated Σ / Δ indicators

POWER & CONNECTIVITY

±12 V. 10-Pin IDC / Keyed Headers. Red Stripe: −12 V.

LA CIRCUITS, INC.

Official Website — https://circuits.audio
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Email — contact@circuits.audio

https://www.circuits.audio