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The '''SSM 2040''' IC is a [[Filters|4-pole filter]] from [[Solid State Micro Technology For Music]] (SSM). Regarded as one of the best sounding filters, because of the way resonance and small amounts of soft distortion when overdriven, can add harmonics to the original signal.<ref name="jg">''[http://www.siliconbreakdown.com/msl/chip.html The SSM 2040 Integrated Circuit]'', by James Gideon, 2006</ref> |
The '''SSM 2040''' IC is a [[Filters|4-pole filter]] from [[Solid State Micro Technology For Music]] (SSM). Regarded as one of the best sounding filters, because of the way resonance and small amounts of soft distortion when overdriven, can add harmonics to the original signal.<ref name="jg">''[http://www.siliconbreakdown.com/msl/chip.html The SSM 2040 Integrated Circuit]'', by James Gideon, 2006</ref> |
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==History == |
== History == |
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Designed by [[Dave Rossum]] of [[E-mu Systems]] and used in the first 2 versions of the [[Sequential Circuits Prophet 5]]. 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> |
Designed by [[Dave Rossum]] of [[E-mu Systems]] and used in the first 2 versions of the [[Sequential Circuits Prophet 5]]. 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> |
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== Circuit building block == |
== Circuit building block == |
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The device's cutoff frequency can be [[Exponential|exponentially]] [[voltage controlled]] over a 10,000 to 1 range. It is an extremely flexible circuit building block which can be used in virtually any active filter design including low-pass, high-pass, band-pass and notch. Roll-off characteristics can be selected to be Butterworth, Chebyshev, Cauer, Bessel or any other filter type.<ref name="data">[http://www.sdiy.info/w/images/SSM2044_datasheet.pdf SSM 2044 data sheet]</ref> |
The device's cutoff frequency can be [[Exponential|exponentially]] [[voltage controlled]] over a 10,000 to 1 range. It is an extremely flexible circuit building block which can be used in virtually any active filter design including low-pass, high-pass, band-pass and notch. Roll-off characteristics can be selected to be Butterworth, Chebyshev, Cauer, Bessel or any other filter type.<ref name="data">[http://www.sdiy.info/w/images/SSM2044_datasheet.pdf SSM 2044 data sheet]</ref> |
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== Clones and schematics == |
== Clones and schematics == |
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In chronological order: |
In chronological order: |
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* [http://analogue.bytenoise.co.uk/message/70a13992bd45f021330686a0f3795f991885e041 discrete SSM2040-style filter] by Jürgen Haible, 1997. |
* [http://analogue.bytenoise.co.uk/message/70a13992bd45f021330686a0f3795f991885e041 discrete SSM2040-style filter] by Jürgen Haible, 1997. |
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* [http://www.jhaible.com/tonline_stuff/jh2040.gif SSM2040 Style 4 pole Filter] by [[Jürgen Haible]], 1998. A [[discrete]] version that reproduces the original sound. A lot of component selection is needed (matching transistor pairs). The circuit is not a pin for pin replacement, and it has a voltage controlled resonance path added. There'a little error in the drawing: the pnp current mirrors have C and E mixed up. |
* [http://www.jhaible.com/tonline_stuff/jh2040.gif SSM2040 Style 4 pole Filter] by [[Jürgen Haible]], 1998. A [[discrete]] version that reproduces the original sound. A lot of component selection is needed (matching transistor pairs). The circuit is not a pin for pin replacement, and it has a voltage controlled resonance path added. There'a little error in the drawing: the pnp current mirrors have C and E mixed up. |
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* [http://www.schmitzbits.de/rs2040.html SMD SSM 2040 filter] by René Schmitz, 1999 |
* [http://www.schmitzbits.de/rs2040.html SMD SSM 2040 filter] by René Schmitz, 1999 |
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* [http://electro-music.com/forum/topic-57575.html&postorder=asc Discrete Transistor 2040 SVVCF] by Scott Stites, electro-music.com forum, Apr. 2013 |
* [http://electro-music.com/forum/topic-57575.html&postorder=asc Discrete Transistor 2040 SVVCF] by Scott Stites, electro-music.com forum, Apr. 2013 |
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== |
== Synthesizers etc. using the SSM 2040 or clone == |
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* [http://www.digisound80.co.uk/digisound/modules/80-7.htm Digisound 80-7]. In 1982 this was replaced by the [[CEM 3320]] based 80-7A which offered the same features but with lower noise and improved resonance.<ref>[http://www.digisound80.co.uk/digisound/other_documents/brochure_files/1983-01_News_Notes.pdf News and Notes], January 1983, Digisound Ltd.</ref> |
* [http://www.digisound80.co.uk/digisound/modules/80-7.htm Digisound 80-7]. In 1982 this was replaced by the [[CEM 3320]] based 80-7A which offered the same features but with lower noise and improved resonance.<ref>[http://www.digisound80.co.uk/digisound/other_documents/brochure_files/1983-01_News_Notes.pdf News and Notes], January 1983, Digisound Ltd.</ref> |
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* [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] |
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* [http://synthark.com/synthesizer-museum/emu-gallery/emulator-archive/synthesizers/audity-overview/ E-mu Systems Blue Box and Audity] |
* [http://synthark.com/synthesizer-museum/emu-gallery/emulator-archive/synthesizers/audity-overview/ E-mu Systems Blue Box and Audity] |
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* [http://synthark.com/synthesizer-museum/emu-gallery/emulator-archive/ssm/voice-card/ E-mu Systems SSM Voice Card] |
* [http://synthark.com/synthesizer-museum/emu-gallery/emulator-archive/ssm/voice-card/ E-mu Systems SSM Voice Card] |
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* Hearn Morley [[HM2040]] potted module. |
* Hearn Morley [[HM2040]] potted module. |
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* [http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2] |
* [http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2] |
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* [http://www.mattsonminimodular.com/shop/index.php?main_page=product_info&products_id=1 Mattson Mini Modular FV1-B], based on the SSM 2040 designed by [[Jim Patchell]] |
* [http://www.mattsonminimodular.com/shop/index.php?main_page=product_info&products_id=1 Mattson Mini Modular FV1-B], based on the SSM 2040 designed by [[Jim Patchell]] |
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* [http://www.noniandjim.com/Jim/smb1/smb.html SMB-1 Project] |
* [http://www.noniandjim.com/Jim/smb1/smb.html SMB-1 Project] |
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* [http://www.vintagesynth.com/misc/octavecat.php SRM Synthesizer Octave Cat] |
* [http://www.vintagesynth.com/misc/octavecat.php SRM Synthesizer Octave Cat] |
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* [http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007. |
* [http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007. |
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* [[Steiner EVI]] |
* [[Steiner EVI]] |
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* [http://www.synthtech.com/motm440.html Synthesis Technology MOTM-440] |
* [http://www.synthtech.com/motm440.html Synthesis Technology MOTM-440] |
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== Further reading == |
== Further reading == |
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* [http://www.sdiy.info/w/images/SSM2044_datasheet.pdf SSM 2044 data sheet] |
* [http://www.sdiy.info/w/images/SSM2044_datasheet.pdf SSM 2044 data sheet] |
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* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, ISBN |
* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, ISBN 0-8306-2753-3, Chapter 6: ''A four-pole lowpass VCF – SSM2040'' |
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* ''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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* ''Two ICs For Electronic Music |
* ''Two ICs For Electronic Music – SSM2020 And SSM2040'' by Dave Rossum, [[Electronotes]] 78, Volume 9, 1977, p. 15 |
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* ''Reader's Circuits |
* ''Reader's Circuits – VCF With SSM2040'' by Rich Ryan, Electronotes 84, Volume 9, 1977, p. 17 |
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* ''A Fourth Order State-Variable Filter'' by Bob Chidlaw, Electronotes 99, Volume 11, 1979, p. 3 |
* ''A Fourth Order State-Variable Filter'' by Bob Chidlaw, Electronotes 99, Volume 11, 1979, p. 3 |
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* ''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 |
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* Circuit for dynamic control of phase shift, [http://www.google.co.uk/patents/US3969682 US Patent US3969682], by David Rossum, 1974 |
* Circuit for dynamic control of phase shift, [http://www.google.co.uk/patents/US3969682 US Patent US3969682], by David Rossum, 1974 |
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* SSM 2040 data sheet at [http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon], [http://www.cem3374.com/datasheets.htm CEM3374.com] or [http://www.digisound80.co.uk/digisound/other_documents/brochure_files/SSM2040.pdf Digisound80.co.uk] |
* SSM 2040 data sheet at [http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon], [http://www.cem3374.com/datasheets.htm CEM3374.com] or [http://www.digisound80.co.uk/digisound/other_documents/brochure_files/SSM2040.pdf Digisound80.co.uk] |
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* [http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007. |
* [http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007. |
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* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html SSM 2040 style VCF + discrete VCA (AMORE)], 2011. Both circuits by René Schmitz. |
* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html SSM 2040 style VCF + discrete VCA (AMORE)], 2011. Both circuits by René Schmitz. |
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* [http://www.siliconbreakdown.com/msl/chip.html The SSM 2040 Integrated Circuit], by James Gideon, 2006. Discusses the IC, the ways it can be configured and the discrete version by Jürgen Haible. |
* [http://www.siliconbreakdown.com/msl/chip.html The SSM 2040 Integrated Circuit], by James Gideon, 2006. Discusses the IC, the ways it can be configured and the discrete version by Jürgen Haible. |
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Revision as of 19:22, 3 May 2017
The SSM 2040 IC is a 4-pole filter from Solid State Micro Technology For Music (SSM). Regarded as one of the best sounding filters, because of the way resonance and small amounts of soft distortion when overdriven, can add harmonics to the original signal.[1]
History
Designed by Dave Rossum of E-mu Systems and used in the first 2 versions of the Sequential Circuits Prophet 5. 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]
Circuit building block
The device's cutoff frequency can be exponentially voltage controlled over a 10,000 to 1 range. It is an extremely flexible circuit building block which can be used in virtually any active filter design including low-pass, high-pass, band-pass and notch. Roll-off characteristics can be selected to be Butterworth, Chebyshev, Cauer, Bessel or any other filter type.[4]
Clones and schematics
In chronological order:
- discrete SSM2040-style filter by Jürgen Haible, 1997.
- SSM2040 Style 4 pole Filter by Jürgen Haible, 1998. A discrete version that reproduces the original sound. A lot of component selection is needed (matching transistor pairs). The circuit is not a pin for pin replacement, and it has a voltage controlled resonance path added. There'a little error in the drawing: the pnp current mirrors have C and E mixed up.
- SMD SSM 2040 filter by René Schmitz, 1999
- 4-pole VCF by Osamu Hoshuyama, 2002
- The SSM 2040 Integrated Circuit, by James Gideon, 2006
- SSM 2040 style VCF + discrete VCA (AMORE), 2011. Both circuits by René Schmitz.
- Discrete Transistor 2040 SVVCF by Scott Stites, electro-music.com forum, Apr. 2013
Synthesizers etc. using the SSM 2040 or clone
- Digisound 80-7. In 1982 this was replaced by the CEM 3320 based 80-7A which offered the same features but with lower noise and improved resonance.[5]
- Division 6 Filtare SEIII
- E-mu Systems Blue Box and Audity
- E-mu Systems SSM Voice Card
- Hearn Morley HM2040 potted module.
- Mad Science Lab SSM2
- Mattson Mini Modular FV1-B, based on the SSM 2040 designed by Jim Patchell
- Radio Junk Box 2040 VCF
- RSF Kobol Expander I
- Sequential Circuits Prophet 5 Rev. 1 & 2
- SMB-1 Project
- SRM Synthesizer Octave Cat
- SSM2040 VCF by Ryan Williams, March 2007.
- Steiner EVI
- Synthesis Technology MOTM-440
- Tiptop Audio Z2040
- VCF/Phase Shifter by Craig Anderton, AMS-100 guitar processor, Device 6, 1979
- Vedic Scapes Model 2040, uses the HM2040
- Voltage Controlled Phase Shifter module by Craig Anderton, AMS-100 guitar processor, Device 4, 1979
 | This article is a stub. You can help the Synth DIY Wiki by expanding it. |
See also
References
- ^ The SSM 2040 Integrated Circuit, by James Gideon, 2006
- ^ SSM 2040 Voltage Controlled Filter Chip History, Mad Science Lab 2008
- ^ SSM 2040 VCF with LFO, Mad Science Lab 2008
- ^ SSM 2044 data sheet
- ^ News and Notes, January 1983, Digisound Ltd.
Further reading
- SSM 2044 data sheet
- Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, ISBN 0-8306-2753-3, 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
- 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
- Circuit for dynamic control of phase shift, US Patent US3969682, by David Rossum, 1974
- SSM 2040 data sheet at MaxMidi Rare Silicon, CEM3374.com or Digisound80.co.uk
- SSM2040 VCF by Ryan Williams, March 2007.
- SSM 2040 style VCF + discrete VCA (AMORE), 2011. Both circuits by René Schmitz.
- The SSM 2040 Integrated Circuit, by James Gideon, 2006. Discusses the IC, the ways it can be configured and the discrete version by Jürgen Haible.
- Additional Design Ideas For Voltage-Controlled Filters by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. 5