V.C.HARMONIC MULTIPLIER / V.C.BALANCED MODULATOR
MODULE 9027

VOLTAGE CONTROLLED HARMONIC MULTIPLIER

FEATURES:

  • ADDS MULTIPLE HARMONIC TEXTURES TO ANY SLOPED OR CURVED WAVEFORM
  • CAN BE USED AS A VOLTAGE CONTROLLED DISTORTION DEVICE
  • COMPLEX TEXTURES GENERATED WHEN USED AFTER FILTERING
  • DUAL INPUTS ALLOW FOR COMPLEX BALANCED MODULATOR EFFECTS

VOLTAGE CONTROLLED BALANCED MODULATOR

FEATURES:

  • USES DISCRETE TRANSISTOR TRANSCONDUCTANCE PRINCIPAL - HIGH SPEED
  • LOW NOISE , LOW DISTORTION AND HIGH SLEW RATE
  • SELECTABLE COUPLING ON SIGNAL INPUT
  • VOLTAGE CONTROLLED SELECTION OF CARRIER SOURCE (CROSSFADE)
  • LED INDICATOR OF CARRIER SOURCE
  • CROSSFADE RUNS AT AUDIO FREQUENCY FOR COMPLEX MODULATION EFFECTS
  • CAN BE USED AS A QUAD INPUT BALANCED MODULATOR
  • ALL INPUTS FUNCTION AT AUDIO FREQUENCY - NO OPTOISOLATORS
  • CAN BE USED AS A VCA

THE C.M.S. 9027 MODULE CONTAINS TWO INNOVATIVE AND DISTINCTIVLY COMPLEX WAVEFORM PROCESSING CIRCUITS

THE VOLTAGE CONTROLLED HARMONIC MULTIPLIER IS DESIGNED FOR ADDING MULTIPLE HARMONIC OVERTONES TO SMOOTH OR SLOPED WAVEFORMS AS WELL AS COMPLEX WAVEFORMS. THIS UNIT IS ALSO VERY USEFUL IN PRE VCF AND POST VCF APPLICATIONS. SEPARATE POSITIVE AND NEGATIVE INPUTS YIELD DIFFERENT RESPONSES. WHEN 2 VCOS ARE FED INTO EACH INPUT, THE CIRCUIT PRODUCES VOLTAGE CONTROLLED COMPLEX RING MODULATOR TYPE WAVEFORMS. THE UNIT CAN ALSO BE USED FOR VOLTAGE CONTROLLED HARMONIC DISTORTION ON EXTERNAL NATURAL SOURCES. TWO ATTENUATED MODULATION CONTROL INPUTS ARE PROVIDED.

THE BALANCED MODULATOR IS A HIGH ACCURACY, DISCRETE MULTIPLIER EMPLOYING DOUBLE WILSON CURRENT MIRRORS COUPLED WITH A HIGH SPEED VOLTAGE CONTROLLED MIXER FOR SELECTION OF THE CARRIER SOURCE OF THE MULTIPLIER. IT HAS 4 ATTENUATED INPUTS: SIGNAL, CARRIER A, CARRIER B, AND MODULATION. THIS UNIT CAN FUNCTION AS A STANDARD BALANCED MODULATOR BUT ALSO HAS SOME EXTREMELY INNOVATIVE OPERATING MODES: 1 - WHEN 2 SEPARATE VCOS ARE FED INTO EACH CARRIER INPUT, AMAZING MORPHING TEXTURES ARE POSSIBLE THROUGH VOLTAGE CONTROL OF THE MODULATION INPUT. 2 - 10 V D.C. IS NORMALLED TO THE CARRIER A INPUT. IN THIS MODE, THE CARRIER WAVEFORM IS PATCHED INTO THE CARRIER B INPUT, WHEN THE MODULATION VOLTAGE IS VARIED, THE RING MODULATION AMOUNT WILL VARY FROM DRY TO FULL RING MODULATION. 3 - THE MODULATION INPUT IS CAPABLE OF RUNNING AT AUDIO FREQUENCY FOR VERY COMPLEX TONALITIES. 4 - CARRIER A IS D.C. COUPLED TO FACILITATE THE STANDARD VCA FUNCTION. CARRIER INPUT B IS A.C. COUPLED AS AN ALTERNATIVE. 5 - THE SIGNAL INPUT IS PROVIDED WITH A SWITCH PROVIDING AC OR DC COUPLING . THIS PROVIDES MORE OPTIONS ON PROCESSING AUDIO SIGNALS AS WELL AS PROVIDING AN OUTPUT FOR THE VOLTAGE CONTROLLED MIXER WHEN 10V DC IS APPLIED.

PLEASE NOTE: DUE TO THE COMPLEX NATURE OF THIS MODULE, IT IS NOT PURELY DISCRETE. IT IS A HYBRID, MEANING IT USES A COMBINATION OF MATCHED TRANSISTORS AND INTEGRATED CIRCUITS (CHIPS). ALL PROCESSING SECTIONS INCLUDING ALL TRANSCONDUCTANCE STAGES USE OUR SPECIALLY MATCHED DISCRETE TRANSISTORS. LEVEL BOOSTING IS PERFORMED BY HIGH SLEW RATE, LOW NOISE INTEGRATED CIRCUITS.

ELECTRICAL SPECIFICATIONS:

INPUTS:

  • HARMONIC MODULATION: EXPONENTIAL - 1DB PER VOLT
  • BALANCED MODULATION: (INA X INB)/10
  • NOMINAL AUDIO INPUT: +/-10V MAXIMUM
  • AUDIO INPUT IMPEDANCE: 100K OHM
  • CONTROL INPUT IMPEDANCE: 100K OHM

OUTPUTS:

  • FREQUENCY RESPONSE: +1Db,D.C. - 40KHZ
  • GAIN: UNITY
  • NOMINAL LEVEL: +/-10V MAXIMUM
  • ALL IMPEDANCES: 1K OHM

 

e-mail: filter@discretesynthesizers.com

Phone: 912-727-2195
©2004 Phil Cirocco