C101 OTA Lowpass filter

This product has been discontinued , a new updated version can be found here

The C101 OTA Lowpass filter is a four pole low pass filter (24db/octave) based on four cascade OTA-stages. The design is similar to the one found in classic synthesizers like Roland System 700, Roland System 100m, Roland SH-1, SH-7, SH-101, Roland Jupiter 8, Jen SX1000 and many more.

When the Resonance control is set at a high value the filter will start to oscillate and the C101 can be used as a sine wave VCO. The filter will track perfectly over at least 5-6 octaves and is also temperature compensated.

In many 4-pole low pass filters the output volume drastically drops when the resonance is increased. The C101 OTA Lowpass filter is specially designed to maintain a constant output level at any resonance value ( with the exception of when the filter is set to auto-oscillation ).

Another important feature is that the C101 has voltage controlled resonance.

C101 main characteristics:

            • Filter response 24db/octave

            • Filter self-oscillate

            • Can be used as VCO ( 1V/Octave )

            • Voltage controlled Resonance

            • Temperature compensated

            • Two Frequency Modulation inputs

            • Two audio inputs

            • 1V / Octave input



technical data

  • Module Format : 5U, MU format ( Synthesizers.com, Moog )
  • Module Width :  1 MU ( Moog Unit )
  • Module Depth : 58 mm ( 2,05 inches
  • Power : +15V@23,2mA , -15V@22,1mA
  • Power connectors : Synthesizers.com , MOTM ( 4 pin )
  • Frequency Range :15Hz – 21 KHz
  • Signal Levels : Typical 10Vpp ( -5V to +5V )