CEM3340: Difference between revisions

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>

 

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>