via this auction
"Here is the description from the Yusynth.net website... [additional details there]
"The ARP4072 filter equipped mostly the famous ARP2600 semi-modular synthesizer. I designed my own version of this filter. I have included in the design an input buffer stage and an ouptut buffer stage. The output buffer stage is also used to compensate the loss of low frequencies that is generally observed at high resonance in 24db/octave filters such as the famous Moog ladder.
Curiously enough, neither Bob Moog nor Alan Richard Pearlman cared to compensate for this loss. This is strange knowing that it is quite a simple modification. Such compensation was introduced by Roland for the filter of their nowadays very sought after TB303!"
I really enjoy this filter. The high resonance audio level make-up portion of the circuit works great. Because the filter sounds so strong even with the resonance knob cranked, wicked overdrivin' acid sounds are easily achieved. A vintage ARP2600 is ~$8,000! Get the classic VCF flavor at a fraction of the cost.
Here is a comprehensive list of controls...
Pots
Initial Frequency
Resonance
Audio In 1 Volume
Audio In 2 Volume
CV In 1 Level
CV In 2 Level
Audio/CV Jacks
Audio In 1
Audio In 2
Frequency CV In 1
Frequency CV In 2
1 Volt/Octave In - Only Tracks Properly Over a Couple Octaves!
Resonance CV In
Audio Out
Assembled with:
Features Rare (6) 2SA798 Matched PNP Dual Transistors in Ladder Section of Circuit
Fully Tested and Calibrated
1% Tolerance Capictors and Resistors in Ladder Section of Circuit
Super Shallow Module - 2" Panel Depth
(6) Switchcraft Jacks
(6) Alpha Pots - 24mm Size
(6) Alco Clone Knobs
Bridechamber Panel - Steel / Textured Black Paint / White Silkscreened Ink
Nichicon Audio Grade Electrolytic Capacitors
Xicon Metal Film and Carbon Film Resistors
Double Plated PCBs with Soldermask
20" synthesizers.com to MOTM Power Connector
Runs on +/- 15 Volts"
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