DIY analogue synth project (The SEM VCF 4 Pole prototype Test Demo 02 with JD 990)

Published on Feb 9, 2018 Adamski A.

"Here is a second video exploring polyphonic tones of the JD 990 run through the 4 pole SEM type filter, a few more demos to come on this subject, please feedback and comment regardless if you like or dislike ."



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  • VacoLoco Aurora Filter Tests 20121204
    "Various tests for the VCF in Aurora (my poly synth project), the whine is from the oscilloscope and my phone that was sat next to it whilst recording

    0:00 - 4 Pole filter sweep
    0:30 - a little resonance
    1:00 - more resonance
    1:30 - full resonance (not quite enough yet)
    1:44 - Bandpass mode
    2:13 - 1 Pole mode
    2:44 - 4 pole mode again, with a little over

  • via Mr. Array, via Modcan where you'll find demos.

    "The 68B Matrix filter is based on the filters of the Matrix 12 and Expander synths of the 80's. While not a direct clone this design uses modern components in place of the CEM custom ICs used in the original. The filter responses and sound are faithful to the classic design. The 16 filters are divided into two banks with selection from the front panel via BANK toggle switch. Each of the 8 filters in a bank is provided with a separate output for external mixing and cross fading down-line.

    Module Highlights:

    * 16 Filter responses
    * Separate out for each bank of 8 filters
    * 2 x CV and 1V/OCT control of frequency
    * 16Hz-20kHz range
    * CV Resonance
    * very low distortion and noise design
    * excellent temperature stability and tracking
    * Self Oscillation in Bank L filters.

    Filter Responses:
    Bank L
    * 4 Pole Lowpass
    * 2 Pole Lowpass
    * 2 Pole Bandpass
    * 2 Pole Highpass + 1 Pole Lowpass
    * 3 Pole Highpass + 1 Pole Lowpass
    * 4 Pole Bandpass
    * 2 Pole Notch + 1 Pole Lowpass
    * 3 Pole AllPass + 1 Pole Lowpass

    Bank R
    * 3 Pole Lowpass
    * 1 Pole Lowpass
    * 1 Pole Highpass
    * 2 Pole Highpass
    * 3 Pole Highpass
    * 2 Pole Highpass + 1 Pole Lowpass
    * 2 Pole Notch
    * 3 Pole AllPass

    Specs:
    16Hz-20kHz range
    Output: 1Kohms
    Input: typical 5V pk-pk@100Kohms
    Input CV: 5V @100Kohms
    Power: +15V @35mA, -15V @35mA"




  • via Mr. Array, via Modcan where you'll find demos.

    "The 68B Matrix filter is based on the filters of the Matrix 12 and Expander synths of the 80's. While not a direct clone this design uses modern components in place of the CEM custom ICs used in the original. The filter responses and sound are faithful to the classic design. The 16 filters are divided into two banks with selection from the front panel via BANK toggle switch. Each of the 8 filters in a bank is provided with a separate output for external mixing and cross fading down-line.

    Module Highlights:

    * 16 Filter responses
    * Separate out for each bank of 8 filters
    * 2 x CV and 1V/OCT control of frequency
    * 16Hz-20kHz range
    * CV Resonance
    * very low distortion and noise design
    * excellent temperature stability and tracking
    * Self Oscillation in Bank L filters.

    Filter Responses:
    Bank L
    * 4 Pole Lowpass
    * 2 Pole Lowpass
    * 2 Pole Bandpass
    * 2 Pole Highpass + 1 Pole Lowpass
    * 3 Pole Highpass + 1 Pole Lowpass
    * 4 Pole Bandpass
    * 2 Pole Notch + 1 Pole Lowpass
    * 3 Pole AllPass + 1 Pole Lowpass

    Bank R
    * 3 Pole Lowpass
    * 1 Pole Lowpass
    * 1 Pole Highpass
    * 2 Pole Highpass
    * 3 Pole Highpass
    * 2 Pole Highpass + 1 Pole Lowpass
    * 2 Pole Notch
    * 3 Pole AllPass

    Specs:
    16Hz-20kHz range
    Output: 1Kohms
    Input: typical 5V pk-pk@100Kohms
    Input CV: 5V @100Kohms
    Power: +15V @35mA, -15V @35mA"




Treat Yourself :)

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