CEM3340: Difference between revisions
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== Projects == |
== Projects == |
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The [[Digisound 80-2]] and [[Digisound 80-3|80-3]] are well designed and versatile analogue VCO and VCLFO.<ref>[http://www.soundonsound.com/sos/jan00/articles/digisound80.htm Digisound 80, Modular Synthesizer (Retro)], SOS Jan 2000 by Paul Nagle</ref><ref>[http://www.digisound80.co.uk/digisound/modules/80-2.htm 80-2 Voltage Controlled Oscillator]</ref> To prevent the IC being put under too much stress if/when the outputs are shorted, all outputs should have a series 1K resistor. The triangle wave output is unbuffered and should never be used to drive an output directly, add a J201 FET follower to buffer it.<ref>[https://www. |
The [[Digisound 80-2]] and [[Digisound 80-3|80-3]] are well designed and versatile analogue VCO and VCLFO.<ref>[http://www.soundonsound.com/sos/jan00/articles/digisound80.htm Digisound 80, Modular Synthesizer (Retro)], SOS Jan 2000 by Paul Nagle</ref><ref>[http://www.digisound80.co.uk/digisound/modules/80-2.htm 80-2 Voltage Controlled Oscillator]</ref> To prevent the IC being put under too much stress if/when the outputs are shorted, all outputs should have a series 1K resistor. The triangle wave output is unbuffered and should never be used to drive an output directly, add a J201 FET follower to buffer it.<ref>[https://www.modwiggler.com/forum/viewtopic.php?t=24134 Does the A SOL MC-202 modular kit work on the SH-101?], Muff Wiggler forum, Nov 2010</ref> A better sine output can be achieved by using instead the [[Thomas Henry]] [[VCO-1 waveshaper]].<ref>[http://www.birthofasynth.com/Thomas_Henry/Pages/VCO-1.html The VCO-1 Project]</ref><ref>[https://www.modwiggler.com/forum/viewtopic.php?t=143298 VCO/LFO PCB for CEM3340 chips], Muff Wiggler forum, Aug 2015</ref> |
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== References == |
== References == |
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* [https://imgur.com/gallery/vySr5 Hyperflange + Chorus] by Craig Anderton, Modern Recording & Music, Jul/Sep 1983 |
* [https://imgur.com/gallery/vySr5 Hyperflange + Chorus] by Craig Anderton, Modern Recording & Music, Jul/Sep 1983 |
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* [https://web.archive.org/web/20190613221410/https://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf Build a Precision Controller Clock] by Thomas Henry, Electronotes, May/June 1984, Special Issue E, pp. 11-17. |
* [https://web.archive.org/web/20190613221410/https://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf Build a Precision Controller Clock] by Thomas Henry, Electronotes, May/June 1984, Special Issue E, pp. 11-17. |
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* andrewF [https://www. |
* andrewF [https://www.modwiggler.com/forum/viewtopic.php?t=169673 CEM3340 VCO], Muff Wiggler forum, Oct. 2016, for Eurorack |
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* TimoRozendal [https://www. |
* TimoRozendal [https://www.modwiggler.com/forum/viewtopic.php?t=170054 [pcb+panel] CEM3340 VCO for eurorack (8hp)], Muff Wiggler forum, Oct. 2016 |
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* Datasette [https://www. |
* Datasette [https://www.modwiggler.com/forum/viewtopic.php?t=170929 OPECEM3340 – v3 (True Zero) on its way soon – Morph delayed], Muff Wiggler forum, Nov. 2016 and [https://github.com/xnotox?tab=repositories on Github], for Eurorack |
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* [http://www.birthofasynth.com/Thomas_Henry/Pages/VCO_Maximus-Detail.html The VCO Maximus] by Thomas Henry, 2017 |
* [http://www.birthofasynth.com/Thomas_Henry/Pages/VCO_Maximus-Detail.html The VCO Maximus] by Thomas Henry, 2017 |
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* [https://www.kichink.com/buy/1675875/trilobite-audio/vco-cem3340-pcb VCO CEM3340 PCB], Trilobite.audio |
* [https://www.kichink.com/buy/1675875/trilobite-audio/vco-cem3340-pcb VCO CEM3340 PCB], Trilobite.audio |
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* [https://www. |
* [https://www.modwiggler.com/forum/viewtopic.php?t=200701 Kassutronics VCO 3340] (eurorack) |
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* [https://www. |
* [https://www.modwiggler.com/forum/viewtopic.php?p=2773821 [ORDER] OCTOGINTA-II Digisound 80-2 eurorack version], Muff Wiggler forum, Feb 2018 |
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* [https://www. |
* [https://www.modwiggler.com/forum/viewtopic.php?t=197467 Digisound in eurorack] and [https://www.modwiggler.com/forum/viewtopic.php?t=201029 [ORDER] Digisound eurorack], Muff Wiggler forum, Mar 2018 |
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* [https://www.reddit.com/r/synthdiy/comments/cwq82m/cem3340_vco_schematics_and_pcb/ CEM3340 VCO Schematics and PCB!], Reddit/synthdiy, 28 Aug 2019 |
* [https://www.reddit.com/r/synthdiy/comments/cwq82m/cem3340_vco_schematics_and_pcb/ CEM3340 VCO Schematics and PCB!], Reddit/synthdiy, 28 Aug 2019 |
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Revision as of 17:22, 24 April 2021
The CEM3340 is a self contained VCO, originally produced by Curtis Electromusic Specialties. With both exponential and linear control inputs and up to four output waveforms: triangle, sawtooth, square, and pulse with voltage controllable pulse width. It has full temperature compensation making it extremely stable. Also included is provision for hard and soft synchronization of the frequency, and an output for easy adjustment of high frequency tracking.[1]
In 2016 after twenty or more years of diminishing availabilty, in response to Coolaudio's V3340 re-design of the part to the same specifications, OnChip Systems remanufactured the 3340.[2][3][4]
Projects
The Digisound 80-2 and 80-3 are well designed and versatile analogue VCO and VCLFO.[5][6] To prevent the IC being put under too much stress if/when the outputs are shorted, all outputs should have a series 1K resistor. The triangle wave output is unbuffered and should never be used to drive an output directly, add a J201 FET follower to buffer it.[7] A better sine output can be achieved by using instead the Thomas Henry VCO-1 waveshaper.[8][9]
References
- ^ CEM3340 data sheet
- ^ Curtis Electromusic Specialties, Facebook, 5 June 2016
- ^ Curtis Family Speaks Out Against Behringer Synth Clone Plans Using CEM3340 by Rounik Sethi, Ask.Audio, 21 Mar 2017
- ^ CEM3320/V3320, SDIY list, Sep 2017
- ^ Digisound 80, Modular Synthesizer (Retro), SOS Jan 2000 by Paul Nagle
- ^ 80-2 Voltage Controlled Oscillator
- ^ Does the A SOL MC-202 modular kit work on the SH-101?, Muff Wiggler forum, Nov 2010
- ^ The VCO-1 Project
- ^ VCO/LFO PCB for CEM3340 chips, Muff Wiggler forum, Aug 2015
External links
- Tech note on improving PWM stability of the ALFA AS3340
- Precision Tuning of the AS3340 VCO by Rob Hordijk, September 2018
- The VCO-555 by Thomas Henry an approximation of the CEM3340
- CEM3340 data sheet
- Picture of de-encapsulated defect CEM3340 at Stromeko Synth World
- Dual VCO (CEM3340-based, with thru-zero FM and various types of sync) by Juergen Haible
- Things to come: CEM3340 VCO, nonlinearcircuits, 17 August 2016
- CEM3340 VCO (Voltage Controlled Oscillator) designs by Tom Wiltshire, 27 August 2016
- ICs for Electro-Music (Part 1) by Charles Blakey
- A look at the VCO's of some famous analog synthesizers. by Chris Meyer, The Secret Life of Synthesizers, 25 Oct 2016
Projects
- Eddy Bergman AS3340 VCO
- Digisound 80-2 VCO, 1980
- Digisound 80-3 VCLFO, 1980
- VCO Deluxe by Thomas Henry, Polyphony, Nov/Dec 1981
- Low-Frequency VCO Gives Exponential Response by Thomas Henry, Electronics, January 13, 1983, pp. 168-169.
- Hyperflange + Chorus by Craig Anderton, Modern Recording & Music, Jul/Sep 1983
- Build a Precision Controller Clock by Thomas Henry, Electronotes, May/June 1984, Special Issue E, pp. 11-17.
- andrewF CEM3340 VCO, Muff Wiggler forum, Oct. 2016, for Eurorack
- TimoRozendal [pcb+panel] CEM3340 VCO for eurorack (8hp), Muff Wiggler forum, Oct. 2016
- Datasette OPECEM3340 – v3 (True Zero) on its way soon – Morph delayed, Muff Wiggler forum, Nov. 2016 and on Github, for Eurorack
- The VCO Maximus by Thomas Henry, 2017
- VCO CEM3340 PCB, Trilobite.audio
- Kassutronics VCO 3340 (eurorack)
- [ORDER] OCTOGINTA-II Digisound 80-2 eurorack version, Muff Wiggler forum, Feb 2018
- Digisound in eurorack and [ORDER] Digisound eurorack, Muff Wiggler forum, Mar 2018
- CEM3340 VCO Schematics and PCB!, Reddit/synthdiy, 28 Aug 2019