24Db VOLTAGE CONTROLLED LOWPASS FILTER
MODULE 9005

FEATURES:

  • THE "SUPER-TRANSISTOR" FILTER
  • DISCRETE, VERY LOW NOISE, EXCEPTIONAL CLARITY
  • UTILIZES A COPPER SHIELDED, C.M.S. SUB-MODULE FOR LOW NOISE OPERATION
  • LOW D.C. OFFSET AND CV FEEDTHROUGH FOR "THUMP FREE" OPERATION
  • COUPLER LINKS 2 MODULES FOR 24X24Db BANDPASS AND NOTCH (PHASING)
  • ERGONOMIC, FLOWCHART STYLE GRAPHICS
  • 4 ATTENUATED FM INPUTS
  • 4 INPUT AUDIO MIXER
  • ACCURATE EXPONENTIAL FREQUENCY SCALE

CONSTRUCTION:

  • DISCRETE DIFFERENTIAL MATCHED TRANSISTOR CIRCUIT
  • HIGH QUALITY COMPONENTS, HAND ASSEMBLED AND TESTED
  • MILITARY GRADE HARDWARE, POTENTIOMETERS, JACKS, KNOBS
  • HI RESOLUTION, BRUSHED, BLACK ANODIZED FRONT PANEL
  • HAND SELECTED, LOW NOISE. LARGE GEOMETRY TRANSISTORS
  • SUB-MODULAR DESIGN PROVIDES EASY SERVICE, UPGRADES

C.M.S. MODULE 9005 IS A PURELY DISCRETE HIGH PERFORMANCE VOLTAGE CONTROLLED FOUR-POLE FILTER DESIGNED FOR SUBTRACTIVE SYNTHESIS AND HARMONIC ENHANCEMENT IN THE C.M.S. MODULAR SYSTEM. THIS MODULE UTILIZES C.M.S.'S NEW 4083 DISCRETE HIGH FIDELITY SUBMODULE WITH DISTINCTIVELY UNIQUE CHARACTERISTICS: WARM AND POWERFUL, BRIGHT AND BUZZY WITH RESONANCE, BEAUTIFUL DISTORTION WHEN OVERLOADED. EXTENSIVE C.M.S. RESEARCH WITH VINTAGE SPECIMENS AND YEARS OF EXPERIMENTATION WITH COUNTLESS VARIATIONS ON THE MOOG TRANSISTOR LADDER HAVE RESULTED IN A FILTER EXHIBITING A REMARKABLE VINTAGE SOUND. THIS MODULE IS NOT A COPY OF THE MOOG 904. THIS DISCRETE MODULE HAS A MAXIMUM OUTPUT VOLTAGE OF 26V PP WHERE THE MOOG 904 WAS 4V PP.

REMARKABLE RESONANT TEXTURES CAN BE REALIZED WHEN A 9005 IS COUPLED WITH A 9004 TO ENABLE 24Db X 24Db BANDPASS AND 24Db X 24Db NOTCH RESPONSES WITH SEPARATE RESONANCE SETTINGS ON EACH SLOPE. WHEN A COUPLER SWITCH IS ENGAGED ON THE 9004 MODULE, THE 9004 MAIN CONTROL ADJUSTS THE CENTER FREQUENCY AND THE 9005 MAIN CONTROL ADJUSTS THE BANDWIDTH . BANDWIDTH AND CENTER FREQUENCY CAN ALSO BE VOLTAGE CONTROLLED. THESE RESPONSES CONTRIBUTE GREATLY IN AUDIBLY DEFINING THE C.M.S. MODULAR SYSTEMS UNIQUE SOUND.

VOLTAGE CONTROL OF FREQUENCY IS A STANDARD 1V PER OCTAVE WITH A FRONT PANEL CALIBRATION PORT. THE CONTROL INPUT MIXER HAS 4 INPUTS, THE RIGHT MOST BEING PRE-WIRED TO THE KEYBOARD CV BUSS. A 4 CHANNEL AUDIO MIXER HAS BEEN PROVIDED AT THE INPUT OF THE FILTER. THE FILTER WILL PRODUCE AN ULTRA PURE SINE WAVE WHEN SET TO SELF OSCILLATION AND WILL TRACK THE KEYBOARD ACCURATELY REGARDLESS OF TEMPERATURE OR HUMIDITY.

ELECTRICAL SPECIFICATIONS:

OUTPUTS:

  • CUTOFF FREQUENCY: 30HZ - 35KHZ
  • LOWPASS OUTPUT: 24Db WITH RESONANCE
  • MAXIMUN OUTPUT LEVEL: 26V PP
  • GAIN: UNITY - NOMINAL 10V P-P, +/-10V MAXIMUM
  • ALL IMPEDANCES: 1K OHM

INPUTS:

  • FREQUENCY MODULATION: EXPONENTIAL - 1V PER OCTAVE
  • NOMINAL AUDIO INPUT: 10 V P-P, +/-10V MAXIMUM
  • AUDIO INPUT IMPEDANCE: 100K OHM
  • CONTROL INPUT IMPEDANCE: 100K OHM

e-mail: filter@discretesynthesizers.com

Phone: 912-727-2195
©2004 Phil Cirocco