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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
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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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* Linn 9000 – 4 x CEM3320
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* Marion Systems MS9C - 8 3387
* [[Moog Memorymoog]] – 12 x CEM3310, 19 x CEM3340, 26 x CEM3360
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* [[Oberheim OB-1]] – 2 x CEM3310
* [[Oberheim OB-8]] – 16 x CEM3310, 16 x CEM3320, 16 x CEM3340, 2 x CEM3360
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* [[PPG Wave|PPG Wave 2.0]] – 4 x CEM3310, 4 x CEM3320
* [[PPG Wave|PPG Wave, 2.2 and 2.3]] – 4 x CEM3360
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* Roland Jupiter 8/MKS-80 serial #511800 up (later models) – 4 x CEM3360
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* [[Sequential Circuits Prophet-5]], Rev 3 – 10 CEM3310, 5 x CEM3320, 11 x CEM3340
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=== DIY projects ===
* [[Böhm Soundlab]] – CEM3310, CEM3320, CEM3330, CEM3340
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* [[E&MM Spectrum Synthesizer]] – 2 x CEM3310, 1 x CEM3320, 2 x CEM3330,
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* [[Kijimi]] - 16 AS3340, 24 CEM3360▼
* [[MIDIbox 3396]] – CEM3396▼
▲* [[Paia Proteus]] – 1 CEM3310, 1 CEM3320, 1 CEM3330, 2 CEM3340
▲* [[PAIA EKx-40 VCO]] - 1 CEM3340
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* PAIA EKx-40 VCO - 1 x CEM3340
* [[Thomas Henry]]: Deluxe VCO – CEM3340<ref name="th">Build a better music synthesiser by Thomas Henry, Tab Books Inc, 1987, {{ISBN|0830627553}}</ref>▼
* [[Powertran Transcendent polysynth]] - per voice: 2 x CEM3310, 2 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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