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The '''SSM2040''' is a four pole [[VCF]] IC with the cutoff frequency [[exponential|exponentially]] voltage controlable.<ref name="data">[http://www.cem3374.com/docs/Manuals/datasheets/SSM2040_datasheet.pdf SSM2040 data sheet]</ref> Designed by [[Dave Rossum]] of [[E-mu Systems]] and used in the first 2 versions of the [[Sequential Circuits Prophet 5]]. "This SSM 2040 VCF is widely acknowledged as one of the best filter chips ever put in an [[analog synthesizer]]." Early SSM chips were often defective, and having to pay royalties led Sequential to switch to [[Curtis Electromusic Specialties|Curtis]] ICs in later versions of the Prophet 5.<ref name="msl">[http://www.siliconbreakdown.com/msl/ssm2040History.html SSM 2040 Voltage Controlled Filter Chip History], Mad Science Lab 2008</ref><ref>[http://www.siliconbreakdown.com/msl/ssm2040manual.html SSM 2040 VCF with LFO], Mad Science Lab 2008</ref>
The '''SSM2040''' is a 4-pole [[VCF]] IC with the cutoff frequency [[exponential|exponentially]] voltage controlable.<ref name="data">[http://www.cem3374.com/docs/Manuals/datasheets/SSM2040_datasheet.pdf SSM2040 data sheet]</ref> Designed by [[Dave Rossum]] of [[E-mu Systems]] and used in the first 2 versions of the [[Sequential Circuits Prophet 5]]. "This SSM 2040 VCF is widely acknowledged as one of the best filter chips ever put in an [[analog synthesizer]]." Early SSM chips were often defective, and having to pay royalties led Sequential to switch to [[Curtis Electromusic Specialties|Curtis]] ICs in later versions of the Prophet 5.<ref name="msl">[http://www.siliconbreakdown.com/msl/ssm2040History.html SSM 2040 Voltage Controlled Filter Chip History], Mad Science Lab 2008</ref><ref>[http://www.siliconbreakdown.com/msl/ssm2040manual.html SSM 2040 VCF with LFO], Mad Science Lab 2008</ref>


== SSM2040 clones ==
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== Synthesizers using the SSM2040 ==
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* [http://www.digisound80.co.uk/digisound/modules/80-7_files/80-7_ETI.pdf Digisound 80-7]
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* [http://www.vintagesynth.com/misc/rsf_kobol.php RSF Kobol Expander I]
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* [http://www.vintagesynth.com/sci/p5.php Sequential Circuits Prophet 5 Rev. 1 & 2]
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* [http://www.vintagesynth.com/misc/octavecat.php SRM Synthesizer Octave Cat]
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* [[Steiner EVI]]

== SSM2040 clone implementations ==
* [http://www.division-6.com/products/filtare-seiii-eurorack.php Division 6 Filtare SEIII]
* [http://www.division-6.com/products/filtare-seiii-eurorack.php Division 6 Filtare SEIII]
* Hearn Morley [[HM2040]] potted module.
* Hearn Morley [[HM2040]] potted module.
* [http://www.jhaible.com/tonline_stuff/jh2040.gif Jürgen Haible 4-pole filter], with [[voltage control|VC]] [[resonance]].
* [http://www.jhaible.com/tonline_stuff/jh2040.gif Jürgen Haible 4-pole filter], with [[voltage control|VC]] [[resonance]].
* [http://www.mattsonminimodular.com/shop/index.php?main_page=product_info&products_id=1 Mattson Mini Modular FV1-B]], based on the SSM2040 designed by [[Jim Patchell]]<!-- see also http://www.noniandjim.com/Jim/smb1/smb.html -->
* [http://www.mattsonminimodular.com/shop/index.php?main_page=product_info&products_id=1 Mattson Mini Modular FV1-B], based on the SSM2040 designed by [[Jim Patchell]]<!-- see also http://www.noniandjim.com/Jim/smb1/smb.html -->
* [http://www.synthtech.com/motm440.html Synthesis Technology MOTM-440]
* [http://www.synthtech.com/motm440.html Synthesis Technology MOTM-440]
* [http://www.tiptopaudio.com/z2040.php Tiptop Audio Z2040]
* [http://www.tiptopaudio.com/z2040.php Tiptop Audio Z2040]
* [http://vedicscapes.bandcamp.com/track/model-2040 Vedic Scapes Model 2040], uses the HM2040
* [http://vedicscapes.bandcamp.com/track/model-2040 Vedic Scapes Model 2040], uses the HM2040
* [http://electro-music.com/forum/topic-57575.html&postorder=asc Discrete Transistor 2040 SVVCF] by Scott Stites, Apr. 2013

⚫
== Synthesizers etc. using the SSM2040 ==
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* [http://www.digisound80.co.uk/digisound/modules/80-7_files/80-7_ETI.pdf Digisound 80-7]
⚫
* [http://www.vintagesynth.com/misc/rsf_kobol.php RSF Kobol Expander I]
⚫
* [http://www.vintagesynth.com/sci/p5.php Sequential Circuits Prophet 5 Rev. 1 & 2]
⚫
* [http://www.vintagesynth.com/misc/octavecat.php SRM Synthesizer Octave Cat]
⚫
* [[Steiner EVI]]
* [http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2]
* [http://homepage2.nifty.com/rjb/diy_synthe3.htm Radio Junk Box 2040 VCF]
* [http://hammer.ampage.org/files/Device1-4.PDF Voltage Controlled Phase Shifter module] by Craig Anderton, AMS-100 guitar processor, Device 4, 1979
* [http://hammer.ampage.org/files/Device1-6.PDF VCF/Phase Shifter] by Craig Anderton, AMS-100 guitar processor, Device 6, 1979


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== Further reading ==
== Further reading ==
⚫
* SSM 2040 data sheet at [http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon] or [http://www.cem3374.com/datasheets.htm CEM3374.com]
* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, ISBN 0830627533, Chapter 6: ''A four-pole lowpass VCF - SSM2040''
* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, ISBN 0830627533, Chapter 6: ''A four-pole lowpass VCF - SSM2040''
* ''Electronic Music Circuits'' by Barry Klein, Howard Sams, 1982,ISBN 0-672-21833-X, pages 125-126, 135-137, 141
* ''Electronic Music Circuits'' by Barry Klein, Howard Sams, 1982,ISBN 0-672-21833-X, pages 125-126, 135-137, 141
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* ''Reader's Circuits - VCF With SSM2040'' by Rich Ryan, Electronotes 84, Volume 9, 1977, p. 17
* ''Reader's Circuits - VCF With SSM2040'' by Rich Ryan, Electronotes 84, Volume 9, 1977, p. 17
* ''[http://electronotes.netfirms.com/EN85part.pdf Additional Design Ideas For Voltage-Controlled Filters]'' by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. 5
* ''[http://electronotes.netfirms.com/EN85part.pdf Additional Design Ideas For Voltage-Controlled Filters]'' by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. 5
* ''A Fourth Order State-Variable Filter'' by Bob Chidlaw, Electronotes 99, Volume 11, 1979, p. 3
⚫
* SSM 2040 data sheet at [http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon] or [http://www.cem3374.com/datasheets.htm CEM3374.com]
* ''Musical Applications of Microprocessors'' by Hal Chamberlin, Hayden, 1985 ISBN 0-8104-5768-7, pages 218-220, 599, 603
* ''Musical Applications of Microprocessors'' by Hal Chamberlin, Hayden, 1985 ISBN 0-8104-5768-7, pages 218-220, 599, 603


Revision as of 16:17, 22 April 2015

The SSM2040 is a 4-pole VCF IC with the cutoff frequency exponentially voltage controlable.[1] Designed by Dave Rossum of E-mu Systems and used in the first 2 versions of the Sequential Circuits Prophet 5. "This SSM 2040 VCF is widely acknowledged as one of the best filter chips ever put in an analog synthesizer." Early SSM chips were often defective, and having to pay royalties led Sequential to switch to Curtis ICs in later versions of the Prophet 5.[2][3]

SSM2040 clones

Synthesizers etc. using the SSM2040

See also

References

  1. ^ SSM2040 data sheet
  2. ^ SSM 2040 Voltage Controlled Filter Chip History, Mad Science Lab 2008
  3. ^ SSM 2040 VCF with LFO, Mad Science Lab 2008

Further reading

  • SSM 2040 data sheet at MaxMidi Rare Silicon or CEM3374.com
  • Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, ISBN 0830627533, Chapter 6: A four-pole lowpass VCF - SSM2040
  • Electronic Music Circuits by Barry Klein, Howard Sams, 1982,ISBN 0-672-21833-X, pages 125-126, 135-137, 141
  • Two ICs For Electronic Music - SSM2020 And SSM2040 by Dave Rossum, Electronotes 78, Volume 9, 1977, p. 15
  • Reader's Circuits - VCF With SSM2040 by Rich Ryan, Electronotes 84, Volume 9, 1977, p. 17
  • Additional Design Ideas For Voltage-Controlled Filters by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. 5
  • A Fourth Order State-Variable Filter by Bob Chidlaw, Electronotes 99, Volume 11, 1979, p. 3
  • Musical Applications of Microprocessors by Hal Chamberlin, Hayden, 1985 ISBN 0-8104-5768-7, pages 218-220, 599, 603

External links

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