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Doepfer A-105 SSM 24dB Low Pass VCF Module

Doepfer A-105 SSM 24dB Low Pass VCF Module


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The A-105 is a 24dB low pass filter that bases on the SSM 2044 chip that was used amongst others in following units: Korg Polysix, Korg Mono / Poly, Fairlight II, PPG Wave 2.2 und 2.3, Emu SP-1200, Siel DK600, Siel Opera 6. The first Prophets used the SSM2040 - the precedessor of the 2044 - that generates a very similar sound. The filter convinces with a very powerful sound. The resonance starts quite early to colour the signal and makes a big range of sounds possible up to self-oscillation. The latter provides a very clean sine wave - no wonder, because the SEM2044 chip wasn't designed only as a filter core but also as a sine wave oscillator.

The A-105 is based on the patented so-called "true open loop design" which generates a very fat sound. The filter works with a slope of -24dB per octave and provides voltage controllable resonance up to self-oscillation. The audio input is sensitive so you can distort the audio signal at the input if desired. there's a volume control at the audio input, potentiometers for setting the cutoff frequency and resonance as well as attenuators at the CV inputs for cutoff and resonance.

  • Based on the chip SSM2044
  • Audio input, audio output
  • Two cutoff CV inputs: 1x 1V/octave, 1x with attenuator
  • Resonance CV input with attenuator
  • 3U Eurorack module, 8HP wide, 41mm deep
Module Type Voltage Controlled Filter (VCF)

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