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The '''SSM2040''' 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">''[https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM2040 Integrated Circuit]'', by James Gideon, 2006</ref>
The '''SSM2040''' 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">''[https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM2040 Integrated Circuit]'', by James Gideon, 2006</ref>


== History ==
== History ==
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== Circuit building block ==
== Circuit building block ==
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/wiki/File:SSM2044_datasheet.pdf SSM2044 data sheet]</ref>
The device's cutoff frequency can be [[exponential]]ly [[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">[https://sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM2044 data sheet]</ref>


== Clones and schematics ==
== Clones and schematics ==
In chronological order:
In chronological order:
* [http://analogue.bytenoise.co.uk/message/70a13992bd45f021330686a0f3795f991885e041 discrete SSM2040-style filter] by [[Jürgen Haible]], 1997.
* [https://web.archive.org/web/20160811193937/http://analogue.bytenoise.co.uk/message/70a13992bd45f021330686a0f3795f991885e041 discrete SSM2040-style filter] by [[Jürgen Haible]], 1997.
* [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.
* [http://www.schmitzbits.de/rs2040.html SMD SSM2040 filter] by René Schmitz, 1999
* [http://www.schmitzbits.de/rs2040.html SMD SSM2040 filter] by René Schmitz, 1999
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* Hearn Morley [[HM2040]] potted module.
* Hearn Morley [[HM2040]] potted module.
* [https://web.archive.org/web/20160620213600/http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2]
* [https://web.archive.org/web/20160620213600/http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2]
* [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]]
* [https://web.archive.org/web/20190613230500/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]]
* [http://homepage2.nifty.com/rjb/diy_synthe3.htm Radio Junk Box 2040 VCF]
* [http://homepage2.nifty.com/rjb/diy_synthe3.htm Radio Junk Box 2040 VCF]
* [http://www.vintagesynth.com/misc/rsf_kobol.php RSF Kobol Expander I]
* [http://www.vintagesynth.com/misc/rsf_kobol.php RSF Kobol Expander I]
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* [http://www.synthtech.com/motm440.html Synthesis Technology MOTM-440]
* [http://www.synthtech.com/motm440.html Synthesis Technology MOTM-440]
* [https://web.archive.org/web/20150425232001/http://www.tiptopaudio.com/z2040.php Tiptop Audio Z2040]
* [https://web.archive.org/web/20150425232001/http://www.tiptopaudio.com/z2040.php Tiptop Audio Z2040]
* [http://hammer.ampage.org/files/Device1-6.PDF VCF/Phase Shifter] by Craig Anderton, AMS-100 guitar processor, Device 6, 1979
* [https://web.archive.org/web/20130512191822/http://hammer.ampage.org/files/Device1-6.PDF VCF/Phase Shifter] by Craig Anderton, AMS-100 guitar processor, Device 6, 1979
* [https://web.archive.org/web/20130626235303/http://vedicscapes.bandcamp.com/track/model-2040 Vedic Scapes Model 2040], uses the HM2040
* [https://web.archive.org/web/20130626235303/http://vedicscapes.bandcamp.com/track/model-2040 Vedic Scapes Model 2040], uses the HM2040
* [http://hammer.ampage.org/files/Device1-4.PDF Voltage Controlled Phase Shifter module] by Craig Anderton, AMS-100 guitar processor, Device 4, 1979
* [https://web.archive.org/web/20100706170531/http://hammer.ampage.org/files/Device1-4.PDF Voltage Controlled Phase Shifter module] by Craig Anderton, AMS-100 guitar processor, Device 4, 1979

⚫
{{stub}}


== See also ==
== See also ==
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* [[SSM2044]]
* [[SSM2044]]
* [[SSM2045]]
* [[SSM2045]]
* [[IR3109]]


== References ==
== References ==
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== Further reading ==
== Further reading ==
* [http://www.sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM2044 data sheet]
* [https://sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM2044 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''
* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, {{ISBN|0-830-62755-3}}, 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
* ''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
* ''Two ICs For Electronic Music – SSM2020 And SSM2040'' by Dave Rossum, [[Electronotes]] 78, Volume 9, 1977, p.&nbsp;15
* ''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.&nbsp;17
* ''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.&nbsp;3
* ''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
* ''The Smooth Phaser'' by Thomas Henry, Electronic Musician, June 1988, pp. 78, 80-83.
* ''The Smooth Phaser'' by Thomas Henry, Electronic Musician, June 1988, pp.&nbsp;78, 80-83.


== External links ==
== External links ==
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* SSM2040 data sheet at [https://web.archive.org/web/20150924171345/http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon] or [http://www.digisound80.co.uk/digisound/other_documents/brochure_files/SSM2040.pdf Digisound80.co.uk]
* SSM2040 data sheet at [https://web.archive.org/web/20150924171345/http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon] or [http://www.digisound80.co.uk/digisound/other_documents/brochure_files/SSM2040.pdf Digisound80.co.uk]
* [https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM2040 Integrated Circuit], by James Gideon, 2006. Discusses the IC, the ways it can be configured and the discrete version by Jürgen Haible.
* [https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM2040 Integrated Circuit], by James Gideon, 2006. Discusses the IC, the ways it can be configured and the discrete version by Jürgen Haible.
* ''[http://electronotes.netfirms.com/EN85part.pdf Additional Design Ideas For Voltage-Controlled Filters]'' by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. 5
* ''[https://web.archive.org/web/20190613230522/http://electronotes.netfirms.com/EN85part.pdf Additional Design Ideas For Voltage-Controlled Filters]'' by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p.&nbsp;5
* [https://web.archive.org/web/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.
* [https://web.archive.org/web/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.
=== Projects ===
=== Projects ===
* ''[https://drive.google.com/file/d/0Bx5_5krPS9HMcThRRHRObjRwMUk/ Build the PGS Lowpass Voltage Controlled Filter]'', Common Mode, January 1983, Number 1, pp. 10-15
* ''[https://web.archive.org/web/20190613221410/https://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf Build the PGS Lowpass Voltage Controlled Filter]'', Common Mode, January 1983, Number 1, pp.&nbsp;10–15
* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html SSM2040 style VCF + discrete VCA (AMORE)], 2011. Both circuits by René Schmitz.
* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html SSM2040 style VCF + discrete VCA (AMORE)], 2011. Both circuits by René Schmitz.
* ''[https://drive.google.com/file/d/0Bx5_5krPS9HMcThRRHRObjRwMUk/ Synthesizer Phase Shifter]'' by Thomas Henry, Polyphony, October 1984, pp. 14-17.
* ''[https://web.archive.org/web/20190613221410/https://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf Synthesizer Phase Shifter]'' by Thomas Henry, Polyphony, October 1984, pp.&nbsp;14–17.
* ''[http://electro-music.com/forum/viewtopic.php?t=57575 Discrete Transistor 2040 SVVCF]'' by Scott Stites, electro-music.com, Apr 2013
* ''[http://electro-music.com/forum/viewtopic.php?t=57575 Discrete Transistor 2040 SVVCF]'' by Scott Stites, electro-music.com, Apr 2013


[[Category:Linear ICs]]
[[Category:Filters]]
[[Category:Filters]]
[[Category:SSM ICs]]
[[Category:SSM ICs]]
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{{stub}}

Latest revision as of 22:24, 27 June 2024

The SSM2040 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:

Synthesizers etc. using the SSM2040 or clone

See also

References

  1. ^ The SSM2040 Integrated Circuit, by James Gideon, 2006
  2. ^ SSM2040 Voltage Controlled Filter Chip History, Mad Science Lab 2008
  3. ^ SSM2040 VCF with LFO, Mad Science Lab 2008
  4. ^ SSM2044 data sheet
  5. ^ News and Notes, January 1983, Digisound Ltd.

Further reading

  • SSM2044 data sheet
  • Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, ISBN 0-830-62755-3, 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
  • The Smooth Phaser by Thomas Henry, Electronic Musician, June 1988, pp. 78, 80-83.

External links

Projects

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