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In 1988 with the advent of digital technology and software, Doug Curtis broadened his focus beyond synthesizers forming OnChip Systems and did no further design work on music synthesis products, except for occasional consulting for synth manufacturers until his premature death in 2007. Several more patents in his name are assigned for chips designed into various commercial products.<ref name="emwcem"/><ref>[https://web.archive.org/web/20130429124424/http://curtiselectromusic.com/Doug_Curtis.html Doug Curtis], Curtis Electromusic</ref><ref>[https://web.archive.org/web/20171012050739/http://curtiselectromusic.com/Home_Page.html About the Company], Curtis Electromusic</ref>
In 2016 OnChip Systems re-released the 3340, in response to [[Coolaudio International
== Clones ==
== The designs ==
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== CEM ICs ==
* [[CEM3310]] – [[Envelope generator|Voltage
* [[CEM3320]] – [[Voltage
* [[CEM3328]] –
* [[CEM3330]] – Dual
* [[CEM3335]] – Dual
* [[CEM3340]] – [[Voltage
* [[CEM3345]] –
* [[CEM3350]] – Dual VC
* [[CEM3360]] – Dual VCA
* [[CEM3365]] – Fast Dual [[DAC]]
* [[CEM3372]] - µP
* [[CEM3374]] – Dual VCO
* [[CEM3378]] – Voltage
* [[CEM3379]] – Voltage
* [[CEM3381]] / PDA381 – Dual
* [[CEM3382]] / PDA382 – Dual
* [[CEM3385]] – Dual
* [[CEM3387]] – Low
* [[CEM3389]] – Voltage
* [[CEM3391]] - µP
* [[CEM3394]] - µP
* [[CEM3396]] - µP
* [[CEM5310]] – Hex [[ADSR]] and VCA
* [[CEM5315]] – Quant ADSR and [[
* [[CEM5508]] / PD508 – Octal [[
* [[CEM5512]] – Octal
* [[CEM5510]] – Fast
* [[CEM5530]] – 30
* [[CEM5570]] – [[Bus]]
<ref name="cemds">CEM data sheets</ref><ref name="sch">Various schematics</ref><ref name="cempo">Curtis Electromusic [https://web.archive.org/web/20130502090659/http://curtiselectromusic.com/Product_Overview.html Product Overview]</ref><ref>[http://www.synthtech.com/cem/cemdata.html ''What chip do I have in my synth?''] at www.synthtech.com</ref>
== Synthesizers using CEM ICs ==
=== Prebuilt ===
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* Dynacord Add-one - 8 x CEM3389
* [[EH-30 Modular]] – 2 CEM3310, 4 CEM3330, 4 CEM3340▼
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* Ensoniq SQ-81 – 1 x CEM3360
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* Fender/Rhodes Polaris – 6 x CEM3372, 6 x CEM3374
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* [[Hohner PK150]] - 1 CEM3391▼
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* [[Moog Memorymoog]] – 12 CEM3310, 19 CEM3340, 26 CEM3360▼
* Marion Systems MS9C - 8 3387
* [[Mutronics Mutator]]▼
▲* [[Moog Memorymoog]] – 12 x CEM3310, 19 x CEM3340, 26 x CEM3360
▲* [[Oberheim DX]] – 3 CEM3320
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* [[Oberheim OB-
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* Oberheim Prommer – 1 x CEM3328<!-- or 3320?-->
* [[Octave Plateau Voyetra 8]] – 16 CEM3340 ▼
* Oberheim Xpander – 6 x CEM3372, 6 x CEM3374
* [[Octave The Cat SRM II]] – CEM3340▼
* [[JLCooper filter mod|Oberheim JLCooper filter mod]] – 1 CEM3320 per voice▼
* Polyfusion Series 2000 Synthesizer - 3340 revision D only, revision A and B are based on the μA726 and XR2207
* [[Rhodes Chroma]] – 8 CEM3350, 8 CEM3360 (some versions have 9)▼
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* Rhodes Polaris – 6 x CEM3372, 6 x CEM3374
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* Roland MKS-20 – 5 x CEM3360
* [[Sequential Circuits Drumtraks]] – 2 CEM3320▼
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* Roland Roland SH101 – 1 x CEM3340
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* Sequential Circuits Studio 440 – 1 x CEM3360, 8 x CEM3389, 1 x CEM5530
* [[Simmons SDS1000]] – 3 CEM3394▼
* Sequential Circuits VS – 8 x CEM3378/3379, 4 x CEM3360, 2 x CEM3365, 4 x CEM5510, 2 x CEM5530
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* Simmons SDS8 – 5 x CEM3372
* [[Steiner EVI]] – 1 CEM3340, 1 SSM2040 ▼
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* Solton TS4 - 1 x CEM3360
* [[Waldorf Microwave1 revision A]] – 8 CEM3389▼
* [[Waldorf Microwave1 revision B]] – 8 CEM3387▼
* Syntec Banana – 12 x CEM3310, 12 x CEM3340, 12 x CEM3360
* [[Waldorf Wave]] – 16 CEM3387▼
* Synton Synrix – 2 x CEM3310, 2 x CEM3340, 2 x CEM3350, 1 x CEM3360
* Voyetra 8 - 16 x CEM3340
=== DIY projects ===
* [[Böhm Soundlab]] – CEM3310, CEM3320, CEM3330, CEM3340
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* Dusk work Self-Tuning VCO - 1 x AS3340
* [[E&MM Spectrum Synthesizer]] – 2 CEM3310, 1 CEM3320, 2 CEM3330, 3 CEM3340▼
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* [[MIDIbox 3396]] – CEM3396▼
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* Kijimi - 16 x AS3340, 24 x CEM3360
* [[Powertran Transcendent Polysynth]] – 2 CEM3310 per voice, 2 CEM3340 per voice▼
* [[Thomas Henry]]: Deluxe VCO – CEM3340<ref name="th">Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, {{ISBN|0830627553}}</ref>▼
* PAIA EKx-40 VCO - 1 x CEM3340
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* Thomas Henry: A dual VCA – CEM3330<ref name="th" />
<ref name="sch" /><ref name="cemci">Curtis Electromusic [https://web.archive.org/web/20130502132536/http://curtiselectromusic.com/Customers_and_Instruments.html Customers and Instruments]</ref><ref name="sd">[http://www.sequencer.de/specials/synthesizer_chip.html Synthesizer Database] by Moogulator</ref><ref name="pp">[http://patchpierre.blogspot.co.uk/2012/02/cem-chips-in-doepfer-modules.html CEM chips in Doepfer Modules] by Pierre Serné, 28 Feb. 2012</ref><ref>[http://www.midibox.org/dokuwiki/doku.php?id=midibox_3396 MIDIbox 3396]</ref><ref>[http://www.digisound80.co.uk/digisound/modules/modules.htm Digisound 80 Synthesizer Modules]</ref><ref>Wikipedia:[https://en.wikipedia.org/wiki/CEM_and_SSM_chips_in_synthesizers CEM and SSM chips in synthesizers]</ref>
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== See also ==
* [[Solid State Micro Technology for Music]]
* [[Alfa Rpar AS]]
== References ==
{{reflist}}
== Further reading ==
* ''[https://archive.org/details/ElektorMagazine/Elektor%5Bnonlinear.ir%5D%201981-10/page/n19/mode/1up Synthesiser IC's]'' by H. P. Baumann, Elektor 078, Oct 1981, pp. 10-18
* ''Electronic Music Circuits'' by Barry Klein, Howard Sams, 1982, {{ISBN|067221833X}}
== External links ==
* [https://web.archive.org/web/20080124170117/http://curtiselectromusic.com/ Curtis Electromusic] - archived
* [http://www.alfarzpp.lv/eng/sc/application.php Alfa application specific ICs]
* [http://retrosynthads.blogspot.co.uk/2011/07/curtis-electromusic-specialties-what.html What a Difference a Chip Makes] a quarter page advertisement in Contemporary Keyboard, February 1980
* [http://synth.stromeko.net/DIY.html#CEMpics Pictures of dead CEM chips] at Stromeko Synth World
* [http://www.aes.org/e-lib/browse.cfm?elib=2639 A Monolithic Voltage-Controlled Amplifier Employing Log-Antilog Techniques], by Douglas R Curtis, JAES Volume 24 Issue 2 pp. 93-102, March 1976
* [http://ssmcurtis.com/
* About the CEM3340 - [http://www.muzines.co.uk/articles/ics-for-electro-music/2561 ICs for Electro-Music (Part 1)] by Charles Blakey, Electronics & Music Maker, March 1981
* About the CEM3320, CEM3330 and CEM3310 - [http://www.muzines.co.uk/articles/ics-for-electro-music/2596 ICs for Electro-Music (Part 2)] by Charles Blakey, Electronics & Music Maker, April 1981
* [https://gearspace.com/board/electronic-music-instruments-and-electronic-music-production/1016749-cem-curtis-love-thread.html CEM (Curtis) Love Thread], Gearspace.com, Jul 2015
== YouTube ==
* [https://youtu.be/rslPZYUMQMw New vs. old Curtis CEM3340 rev G comparison]
=== Data sheets ===
[http://www.sdiy.info/wiki/File:CEM3310_datasheet.pdf CEM3310], [http://www.sdiy.info/wiki/File:CEM3310_datasheet_long.pdf CEM3310 long],[http://www.sdiy.info/wiki/File:CEM3312_datasheet.pdf CEM3312], [http://www.sdiy.info/wiki/File:CEM3320_datasheet.pdf CEM3320], [http://www.sdiy.info/wiki/File:CEM3320_datasheet_long.pdf CEM3320 long], [http://www.sdiy.info/wiki/File:CEM3328_datasheet.pdf CEM3328], [http://www.sdiy.info/wiki/File:CEM3330_datasheet.pdf CEM3330], [http://www.sdiy.info/wiki/File:
<br/>Some are also freely available from [http://www.synfo.nl/pages/datasheets.html Synfo.nl]
[[Category:Linear ICs]]
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