SSM2040: Difference between revisions
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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>
== 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 [[OnChip Systems|Curtis]] ICs in later versions of the Prophet 5.<ref name="msl">[https://web.archive.org/web/20141015041238/http://www.siliconbreakdown.com/msl/ssm2040History.html SSM2040 Voltage Controlled Filter Chip History], Mad Science Lab 2008</ref><ref>[https://web.archive.org/web/20141015041311/http://www.siliconbreakdown.com/msl/ssm2040manual.html SSM2040 VCF with LFO], Mad Science Lab 2008</ref>
== Circuit building block ==
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* [http://www.schmitzbits.de/rs2040.html SMD SSM2040 filter] by René Schmitz, 1999
* [http://www5b.biglobe.ne.jp/~houshu/synth/Vcf0211a.GIF 4-pole VCF] by Osamu Hoshuyama, 2002
* [https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM2040 Integrated Circuit], by James Gideon, 2006
* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html SSM2040 style VCF + discrete VCA (AMORE)], 2011. Both circuits by René Schmitz.
* [http://electro-music.com/forum/topic-57575.html&postorder=asc Discrete Transistor 2040 SVVCF] by Scott Stites, electro-music.com forum, Apr. 2013
== Synthesizers etc. using the SSM2040 or clone ==
* [https://web.archive.org/web/20160211063850/http://www.amsynths.co.uk
* [http://www.digisound80.co.uk/digisound/modules/80-7.htm Digisound 80-7]. In 1982 this was replaced by the [[CEM3320]] based 80-7A which offered the same features but with "lower noise and improved resonance level".<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.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/ssm/voice-card/ E-mu Systems SSM Voice Card]
* Hearn Morley [[HM2040]] potted module.
* [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]]
* [http://homepage2.nifty.com/rjb/diy_synthe3.htm Radio Junk Box 2040 VCF]
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* [http://www.noniandjim.com/Jim/smb1/smb.html SMB-1 Project]
* [http://www.vintagesynth.com/misc/octavecat.php SRM Synthesizer Octave Cat]
* [https://web.archive.org/web/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.
* [[Steiner EVI]]
* [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]
* [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
* [http://hammer.ampage.org/files/Device1-4.PDF Voltage Controlled Phase Shifter module] by Craig Anderton, AMS-100 guitar processor, Device 4, 1979
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== External links ==
* Circuit for dynamic control of phase shift, [http://www.google.co.uk/patents/US3969682 US Patent US3969682], by David Rossum, 1974
* 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.
* ''[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/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.
=== 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
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