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AJH Synth
MiniMod VCF (Black) - 14HP

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Item: N13-4459

Availability: In stock

$295.00
MiniMod VCF (Black) - 14HP

AJH Synth MiniMod VCF (Black)

The AJH Synth MiniMod VCF is a recreation of the 24dB/Oct low-pass transistor ladder filter used in the classic Moog Model D synthesizer. It features a three-channel input mixer, dedicated filter cutoff knob, and both 1/3” and 2/3” CV ins that faithfully emulate the original Model D’s VCF switches. There’s also a variable CV input offering additional modulation possibilities. 

In addition to a manual Emphasis control, there is now a vactrol-controlled CV input for voltage controlled resonance. Since the input features a vactrol, it can reach audio rates, allowing the filter to self-oscillate for use as a sine wave oscillator. 

This is the BLACK version of the MiniMod VCF. 

MiniMod VCF (Black) Features

  • Eurorack Replica of the 24db/octave Low Pass Transistor Ladder Filter used in the early Moog Model D Synthesizer
  • 3 Channel Input Mixer
  • 1 Filter Signal Output
  • 1V/OCT Input: Changes the filter cutoff at the rate of 1V per Octave, or if the filter is in full self-oscillation (Emphasis Control fully CW) it will control the pitch of the resulting sine wave at the rate of 1V/OCT (When compared to the Model D this emulates having “Keyboard Control” switches 1 and 2 “ON”)
  • Frequency CV Input
  • 1/3 CV Input: Changes the filter cutoff at the rate of 333mV per Octave (When compared to the Model D this is the equivalent of having “Keyboard Control” switch 1 “ON” and switch 2 “OFF”)
  • 2/3 CV Input: Changes the filter cutoff at the rate of 666mV per Octave (When compared to the Model D this is the equivalent of having “Keyboard Control” switch 1 “OFF” and switch 2 “ON”)
  • Emphasis CV Input: ±5V
  • Emphasis CV Input Level Control: 0% to 100% (Manual Emphasis Level Control is still active and acts as an offset control)
  • Emphasis Level Control (Resonance Level Control): Self-Oscillates between positions 8 and 10
  • Filter Cutoff Control
  • Frequency CV Level Control: 0% to 130% (Greater range than the 1V/OCT Input so over-modulation effects are possible)
  • Input Level Control for Inputs 1, 2, and 3

MiniMod VCF Demo

AJH MiniMod Eurorack Demo from Perfect Circuit Audio on Vimeo.

The first patch in this video is a bass sound with two saw oscillators overdriving the Transistor Ladder Filter. The second patch uses the shark tooth waves as well sub bass waveforms generated by the Ring SM module, a delay makes the sequence sound more complex and a second MiniMod Filter is used on the delay repeats. In the third patch one oscillator is sync'ed to the other and the delay is still used.

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  • Eurorack Module
  • 14 HP Width
  • 26mm Depth
  • Current Draw: 45mA @ +12V, 30mA @ -12V

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