CEM3340: Difference between revisions

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In 2016 after twenty or more years of diminishing availabilty, in response to [[Coolaudio International Limited|Coolaudio's]] [http://www.coolaudio.com/features-page.php?product=V3340D V3340] re-design of the part to the same specifications, OnChip Systems remanufactured the 3340.<ref>[https://www.facebook.com/curtischips/posts/1173548609342828 Curtis Electromusic Specialties], Facebook, 5 June 2016</ref><ref>[https://ask.audio/articles/curtis-family-speaks-out-against-behringer-synth-clone-plans-using-cem3340 Curtis Family Speaks Out Against Behringer Synth Clone Plans Using CEM3340] by Rounik Sethi, Ask.Audio, 21 Mar 2017</ref><ref>[http://synth-diy.org/pipermail/synth-diy/2017-September/166135.html CEM3320/V3320], SDIY list, Sep 2017</ref>
In 2016 after twenty or more years of diminishing availabilty, in response to [[Coolaudio International Limited|Coolaudio's]] [http://www.coolaudio.com/features-page.php?product=V3340D V3340] re-design of the part to the same specifications, OnChip Systems remanufactured the 3340.<ref>[https://www.facebook.com/curtischips/posts/1173548609342828 Curtis Electromusic Specialties], Facebook, 5 June 2016</ref><ref>[https://ask.audio/articles/curtis-family-speaks-out-against-behringer-synth-clone-plans-using-cem3340 Curtis Family Speaks Out Against Behringer Synth Clone Plans Using CEM3340] by Rounik Sethi, Ask.Audio, 21 Mar 2017</ref><ref>[http://synth-diy.org/pipermail/synth-diy/2017-September/166135.html CEM3320/V3320], SDIY list, Sep 2017</ref>


== Projects ==
== Usage ==
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?], Mod 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], Mod Wiggler forum, Aug 2015</ref>
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?], Mod 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], Mod Wiggler forum, Aug 2015</ref>


Revision as of 12:05, 30 November 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]

Usage

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

  1. ^ CEM3340 data sheet
  2. ^ Curtis Electromusic Specialties, Facebook, 5 June 2016
  3. ^ Curtis Family Speaks Out Against Behringer Synth Clone Plans Using CEM3340 by Rounik Sethi, Ask.Audio, 21 Mar 2017
  4. ^ CEM3320/V3320, SDIY list, Sep 2017
  5. ^ Digisound 80, Modular Synthesizer (Retro), SOS Jan 2000 by Paul Nagle
  6. ^ 80-2 Voltage Controlled Oscillator
  7. ^ Does the A SOL MC-202 modular kit work on the SH-101?, Mod Wiggler forum, Nov 2010
  8. ^ The VCO-1 Project
  9. ^ VCO/LFO PCB for CEM3340 chips, Mod Wiggler forum, Aug 2015

External links

Projects

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