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The '''
== 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
== Circuit building block ==
The device's cutoff frequency can be [[
== Clones and schematics ==
In chronological order:
* [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.schmitzbits.de/rs2040.html SMD
* [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
* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html
* [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
* [https://web.archive.org/web/20160211063850/http://www.amsynths.co.uk/mysynths/filter-bank/am8040-e-mu-systems-low-pass-filter/ AMSynths AM8040]
* [http://www.digisound80.co.uk/digisound/modules/80-7.htm Digisound 80-7]. In 1982 this was replaced by the [[
* [http://www.division-6.com/products/filtare-seiii-eurorack.php Division 6 Filtare SEIII]
* [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/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]
* [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
* [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]
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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]
* [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/20100706170531/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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== See also ==
* [[
* [[
* [[
* [[IR3109]]
== References ==
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== Further reading ==
* [
* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, {{ISBN
* ''Electronic Music Circuits'' by Barry Klein, Howard Sams, 1982,
* ''Two ICs For Electronic Music – SSM2020 And SSM2040'' by Dave Rossum, [[Electronotes]] 78, Volume 9, 1977, p.
* ''Reader's Circuits – VCF With SSM2040'' by Rich Ryan, Electronotes 84, Volume 9, 1977, p.
* ''A Fourth Order State-Variable Filter'' by Bob Chidlaw, Electronotes 99, Volume 11, 1979, p.
* ''Musical Applications of Microprocessors'' by [[Hal Chamberlin]], Hayden, 1985 {{ISBN
* ''The Smooth Phaser'' by Thomas Henry, Electronic Musician, June 1988, pp.
== External links ==
* Circuit for dynamic control of phase shift, [http://www.google.co.uk/patents/US3969682 US Patent US3969682], by David Rossum, 1974
*
* [https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The
* ''[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.
* [https://web.archive.org/web/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.
=== Projects ===
* ''[https://
* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html
* ''[https://
* ''[http://electro-music.com/forum/viewtopic.php?t=57575 Discrete Transistor 2040 SVVCF]'' by Scott Stites, electro-music.com, Apr 2013
[[Category:Filters]]
[[Category:SSM ICs]]
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