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The '''CEM 3340''' is a self contained [[VCO]], 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 [[oscillator sync|hard and soft synchronization]] of the [[frequency]], and an output for easy adjustment of [[VCO high frequency tracking|high frequency tracking]].<ref name="3340ds">[http://www.cem3374.com/datasheets.htm CEM3340 data sheet] at CEM3374.com</ref>
The '''CEM 3340''' is a self contained [[VCO]], 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 [[oscillator sync|hard and soft synchronization]] of the [[frequency]], and an output for easy adjustment of [[VCO high frequency tracking|high frequency tracking]].<ref name="3340ds">[http://www.cem3374.com/datasheets.htm CEM3340 data sheet] at CEM3374.com</ref>


== Projects ==
== Projects ==
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.muffwiggler.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.muffwiggler.com/forum/viewtopic.php?t=143298 VCO/LFO PCB for CEM3340 chips], Muff 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.muffwiggler.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.muffwiggler.com/forum/viewtopic.php?t=143298 VCO/LFO PCB for CEM3340 chips], Muff Wiggler forum, Aug 2015</ref>


==References==
== References ==
{{reflist}}
{{reflist}}


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* [http://www.sdiy.info/w/images/CEM3310_datasheet.pdf CEM 3340 data sheet]
* [http://www.sdiy.info/w/images/CEM3310_datasheet.pdf CEM 3340 data sheet]
* [http://synth.stromeko.net/DIY.html#CEMpics Picture of de-encapsulated defect CEM 3340] at Stromeko Synth World
* [http://synth.stromeko.net/DIY.html#CEMpics Picture of de-encapsulated defect CEM 3340] at Stromeko Synth World
* [http://jhaible.com/legacy/tonline_stuff/hj_modul.html Dual VCO (CEM3340-based, with thru-zero FM and various types of sync)] by Juergen Haible
* [http://jhaible.com/legacy/tonline_stuff/hj_modul.html Dual VCO (CEM3340-based, with thru-zero FM and various types of sync)] by Juergen Haible
* [http://nonlinearcircuits.blogspot.co.uk/2016/08/things-to-come-cem3340-vco.html?m=1 Things to come: CEM3340 VCO], nonlinearcircuits, 17 August 2016
* [http://nonlinearcircuits.blogspot.co.uk/2016/08/things-to-come-cem3340-vco.html?m=1 Things to come: CEM3340 VCO], nonlinearcircuits, 17 August 2016
* [http://electricdruid.net/cem3340-vco-voltage-controlled-oscillator-designs/ CEM3340 VCO (Voltage Controlled Oscillator) designs] by Tom Wiltshire, 27 August 2016
* [http://electricdruid.net/cem3340-vco-voltage-controlled-oscillator-designs/ CEM3340 VCO (Voltage Controlled Oscillator) designs] by Tom Wiltshire, 27 August 2016
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=== Projects ===
=== Projects ===
* [http://www.birthofasynth.com/Thomas_Henry/Pages/VCO_Maximus.html The VCO Maximus story] by Thomas Henry
* [http://www.birthofasynth.com/Thomas_Henry/Pages/VCO_Maximus.html The VCO Maximus story] by Thomas Henry
* andrewF [https://www.muffwiggler.com/forum/viewtopic.php?t=169673 CEM3340 VCO], Muff Wiggler forum, Oct. 2016, for Eurorack
* andrewF [https://www.muffwiggler.com/forum/viewtopic.php?t=169673 CEM3340 VCO], Muff Wiggler forum, Oct. 2016, for Eurorack
* Datasette [https://www.muffwiggler.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
* Datasette [https://www.muffwiggler.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
* TimoRozendal [https://www.muffwiggler.com/forum/viewtopic.php?t=170054 &#x0005B;pcb+panel&#x0005D; CEM3340 VCO for eurorack (8hp)], Muff Wiggler forum, Oct. 2016
* TimoRozendal [https://www.muffwiggler.com/forum/viewtopic.php?t=170054 &#x0005B;pcb+panel&#x0005D; CEM3340 VCO for eurorack (8hp)], Muff Wiggler forum, Oct. 2016


Revision as of 14:26, 2 May 2017

The CEM 3340 is a self contained VCO, 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]

Projects

The Digisound 80-2 and 80-3 are well designed and versatile analogue VCO and VCLFO.[2][3] 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.[4] A better sine output can be achieved by using instead the Thomas Henry VCO-1 waveshaper.[5][6]

References

  1. ^ CEM3340 data sheet at CEM3374.com
  2. ^ Digisound 80, Modular Synthesizer (Retro), SOS Jan 2000 by Paul Nagle
  3. ^ 80-2 Voltage Controlled Oscillator
  4. ^ Does the A SOL MC-202 modular kit work on the SH-101?, Muff Wiggler forum, Nov 2010
  5. ^ The VCO-1 Project
  6. ^ VCO/LFO PCB for CEM3340 chips, Muff Wiggler forum, Aug 2015

External links

Projects

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