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After working for four years at [[Interdesign, Inc.]] [[Doug Curtis]] went on to found Curtis Electromusic Specialties in 1979.<ref name="strom">[http://synth.stromeko.net/DIY.html#CEMpics Pictures of dead CEM chips] at Stromeko Synth World</ref> He did this specifically to design and manufacture [[integrated circuit]]s for [[Synthesizers|music synthesizers]]. Curtis Electromusic Specialties manufacturered a wide variety of [[Integrated circuit|ICs]], many of which incorporated an entire synthesizer functional component, for example, the [[CEM3340]], which contained a complete [[voltage controlled oscillator]]. By using chips from Curtis (and its competitor, [[SSM]]), synth manufacturers were able to considerably reduce the size of their circuitry. This (along with the advent of inexpensive [[microprocessor]] control) is what led to the wave of [[polyphonic]] [[analog synthesizer]]s in the 1980s. By using the Curtis and SSM chips, manufacturers were able to shrink the size of their circuitry to where it could all fit in a package no larger than what was necessary to also house a keyboard and control panel.<ref name="emwcem">[http://electronicmusic.wikia.com/wiki/Curtis_Electromusic Curtis Electromusic], Electronic Music wiki</ref>
Later developments included more highly integrated circuits such as the 3389 signal processor and the 3396 synth-on-a-chip. The further miniaturaization led to the creation of [[rackmount synthesizer]]s, played via [[MIDI]] from a [[keyboard controller|master keyboard]], and saving performers both money and space.<ref name="emwcem"/><ref>[https://web.archive.org/web/20171012050739/http://curtiselectromusic.com/Home_Page.html About the Company], Curtis Electromusic</ref>
== OnChip Systems ==
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 ===
*
*
* Akai VX600 - 12 x CEM3374B, 12 x CEM3378
* Behringer Crave - 1 x CEM3340
* Behringer Neutron - 2 x CEM3340
* Buchla 296e – 1 x CEM3360
* Cheetah MS6 – 6 x CEM3396
* Crumar Bit 99 – 6 x CEM3328
* Crumar Bit One – 6 x CEM3328 in late models
* Crumar Composer – 2 x CEM3310, 2 x CEM3320, 2 x CEM3330
* Crumar Spirit – 2 x CEM3340, 2 x CEM3350, 3 x CEM3360
* Crumar Stratus – 6 x CEM3310, 6 x CEM3320, 6 x CEM3330
* Crumar Trilogy – 6 x CEM3310, 6 x CEM3320, 6 x CEM3330
* Doepfer A-106-6 XP Filter - CEM3379
* Doepfer A-107 Multitype Morphing Filter - CEM3379
* Doepfer A-109 Voltage Controlled Signal Processor - CEM3379
* Doepfer A-111-1 High-End VCO - CEM3340
* Doepfer A-111-2 High End VCO II/VCLFO - CEM3340
* Doepfer A-111-3 Micro Precision VCO - CEM3340
* Doepfer A-111-4 Quad Precision VCO - CEM3340
* Doepfer A-111-5 Synthesizer Voice - CEM3394
* Doepfer A-121 Multimode Filter - CEM3320
* Doepfer A-122 24dB Curtis Low Pass Filter - CEM3320, CEM3379 in later versions
* Doepfer A-123 24dB High Pass - CEM3320
* Doepfer A-124 Wasp Filter - CEM3379
* Doepfer A-126 Voltage Controlled Frequency Shifter - CEM3382
* Doepfer A-130 Voltage Controlled Amplifier - CEM3381 in earlier models, alternately CEM3382
* Doepfer A-131 Voltage Controlled Amplifier - CEM3381 in earlier models, alternately CEM3382
* Doepfer A-132-3 Dual linear/exponential VCA - CEM3360 (early versions)
* Doepfer A-134-1 Voltage Controlled Panner/Crossfader - CEM3381
* Doepfer A-179 Light Controlled Voltage Source - CEM3320
* Doepfer Dark Energy - CEM3394 (original model)
* Dynacord Add-one - 8 x CEM3389
* [[EH-30 Modular]] – 2 x CEM3310, 4 x CEM3330, 4 x CEM3340
* Elka Synthex – 8 x CEM3320
* Elka EK-22 – 6 x CEM3396
* Ensoniq ESQ-1 – 1 x CEM3360, 8 x CEM3379
* Ensoniq ESQ-2 – 1 x CEM3360
* Ensoniq Mirage – 8 x CEM3328
* Ensoniq SDP-1 - 10 x CEM3328
* Ensoniq SQ-80 – 1 x CEM3360, 8 x CEM3379
* Ensoniq SQ-81 – 1 x CEM3360
* Fairlight CMI II – 8 x CEM3320, in earlier versions
* Fender/Rhodes Chroma – 8 x CEM3350, 8 x CEM3360
* Fender/Rhodes Polaris – 6 x CEM3372, 6 x CEM3374
* Forat F9000 – 4 x CEM3320
* Hyperflange + Chorus by Craig Anderton - 1 x CEM3340
* Hohner PK150 - 1 x CEM3391
* Hohner PK250 - 2 x CEM3391
* Keytek CTS-2000 – 8 x CEM3389, 1 x CEM5530
* Kurzweil K250 – 8 x CEM3335
* Linndrum – 2 x CEM3320, 1 x CEM3360
* Linn 9000 – 4 x CEM3320
* Marion Systems MSR-2 - CEM3397
* Marion Systems MS9C - 8 3387
* [[Moog Memorymoog]] – 12 x CEM3310, 19 x CEM3340, 26 x CEM3360
* Mutronics Mutator
* Oberheim DX – 3 x CEM3320
* Oberheim DMX – 1 x CEM3320, or CEM3350 depending upon the voice card
* Oberheim Matrix 6 & 6R – 6 x CEM3396
* Oberheim Matrix 12 – 12 x CEM3374, 12 x CEM3372
* Oberheim Matrix 1000 – 6 x CEM3396
* [[Oberheim OB-1]] – 2 x CEM3310
* [[Oberheim OB-8]] – 16 x CEM3310, 16 x CEM3320, 16 x CEM3340, 2 x CEM3360
* Oberheim OB-SX – 2 x CEM3310, 1 x CEM3320, 2 x CEM3340, 1 x CEM3360 per voice
* Oberheim OB-X – 2 x CEM3310
* Oberheim OB-Xa – 16 x CEM3310, 8 x CEM3320, 16 x CEM3340, 2 x CEM3360
* Oberheim Prommer – 1 x CEM3328<!-- or 3320?-->
* Oberheim Xpander – 6 x CEM3372, 6 x CEM3374
* Octave Plateau Voyetra 8 – 16 x CEM3340
* Octave The Cat SRM II – CEM3340
* JLCooper Oberheim filter mod – per voice: 1 x CEM3320
* Polyfusion Series 2000 Synthesizer - 3340 revision D only, revision A and B are based on the μA726 and XR2207
* [[PPG Wave|PPG Wave 2.0]] – 4 x CEM3310, 4 x CEM3320
* [[PPG Wave|PPG Wave, 2.2 and 2.3]] – 4 x CEM3360
* Rhodes Chroma – 8 x CEM3350, 8 x CEM3360 (some versions have 9)
* Rhodes Polaris – 6 x CEM3372, 6 x CEM3374
* Roland Jupiter 6 – 12 x CEM3340, 6 x CEM3360
* Roland Jupiter 8/MKS-80 to serial #511799 (early models) – 8 x CEM3340, 4 x CEM3360
* Roland Jupiter 8/MKS-80 serial #511800 up (later models) – 4 x CEM3360
* Roland MKS-20 – 5 x CEM3360
* Roland Roland MC202 – 1 x CEM3340
* Roland Roland SH101 – 1 x CEM3340
* Sequential Circuits Drumtraks – 2 x CEM3320
* Sequential Circuits Max – 6 x CEM3394
* Sequential Circuits Multi-Trak – 6 x CEM3394
* Sequential Circuits Pro One – 2 x CEM3310, 1 x CEM3320, 3 x CEM3340
* Sequential Circuits Prophet 10 – 20 x CEM3310, 10 x CEM3320, 22 x CEM3340
* Sequential Circuits Prophet 2000 – 8 x CEM3379
* Sequential Circuits Prophet 3000 – CEM3387
* [[Sequential Circuits Prophet-5]], Rev 3 – 10 CEM3310, 5 x CEM3320, 11 x CEM3340
* Sequential Circuits Prophet 600 – 12 x CEM3340, 4 x CEM3360, 6 x CEM3372
* Sequential Circuits Six-Trax – 6 x CEM3394
* Sequential Circuits Split8 – 8 x CEM3394
* Sequential Circuits Studio 440 – 1 x CEM3360, 8 x CEM3389, 1 x CEM5530
* Sequential Circuits T8 – 16 x CEM3340, 8 x CEM3372
* Sequential Circuits VS – 8 x CEM3378/3379, 4 x CEM3360, 2 x CEM3365, 4 x CEM5510, 2 x CEM5530
* Simmons SDS1000 – 3 x CEM3394
* Simmons SDS200 - 2 x CEM3394
* Simmons SDS400 - 4 x CEM3394
* Simmons SDS7 – – per module: 1 x CEM3340, 1 x CEM3372
* Simmons SDS8 – 5 x CEM3372
* Simmons SDS800 – 4 x CEM3394
* Simmons SDS9 – 1 x CEM3372, 3 x CEM3394
* Solton Programmer 24 - 1 x CEM3350
* Solton TS3 - 3 x CEM3360
* Solton TS4 - 1 x CEM3360
* Steiner EVI – 1 x CEM3340, 1 SSM2040
* Syntec Banana – 12 x CEM3310, 12 x CEM3340, 12 x CEM3360
* Synton Synrix – 2 x CEM3310, 2 x CEM3340, 2 x CEM3350, 1 x CEM3360
* Voyetra 8 - 16 x CEM3340
* Waldorf Microwave1 revision A – 8 x CEM3389
* Waldorf Microwave1 revision B – 8 x CEM3387
* Waldorf Wave – 16 x CEM3387
=== DIY projects ===
* [[Böhm Soundlab]] – CEM3310, CEM3320, CEM3330, CEM3340
* Deckard's Dream - 17 x CEM3340
*
* Digisound 80-16 – 1 x CEM3350
*
*
* Digisound 80-2 – 1 x CEM3340
* Digisound 80-21 – 1 x CEM3340
* Digisound 80-3 – 1 x CEM3340
*
*
*
*
*
*
* Dusk work Self-Tuning VCO - 1 x AS3340
* [[
* [[
* [[
* Juergen Haible Dual VCO - 2 x CEM3340
*
*
* [[PAiA Proteus 1]] – 1 x CEM3310, 1 x CEM3320, 1 x CEM3330, 2 x CEM3340
* PAIA EKx-40 VCO - 1 x CEM3340
* [[Powertran Transcendent polysynth]] - per voice: 2 x CEM3310, 2 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>
* 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>
== See also ==
* [[Solid State Micro Technology
* [[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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