Cosmic Instruments 10HP voltage controlled oscillator Eurorack module based on the famous CEM3340/AS3340 chip
Designed by Cosmic Instruments in Netherlands
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About this module This 10HP Eurorack module has all the features a basic VCO needs. The module is based on the famous CEM3340/AS3340 chip. It outputs multiple waveforms, namely, square waves, triangl…
Read More…This 10HP Eurorack module has all the features a basic VCO needs. The module is based on the famous CEM3340/AS3340 chip. It outputs multiple waveforms, namely, square waves, triangle waves and sawtooth waves. The frequencies of all these waveforms can be voltage controlled using either the V/oct input or the vanilla frequency CV input. Next to that it has more advanced features like hard and soft sync, and also includes a knob and CV input for pulse width modulation. All in all, a great VCO to add to your Eurorack modular synthesizer.
Video here!
Hey folks! Here are some steps to get your Cosmic Instruments 3340 VCO in tune. Note that if you don’t have a device that supports V/Oct, there is no need to tune it. You can then just adjust the knob and trimpot to you liking.
Setup:
Tuning steps:
This approach basically only tunes 2 octaves, although the other ones should also be reasonably in tune. To get a more accurate tuning you can also tune over more octaves (e.g. use C3 and C7).
Cosmic Instruments started off as a synth DIY hobby project and mostly consisted of hand-soldered protoboard modules and hand-drawn front panels. At some point my setup required more robust and reliable modules. I converted many of my modules to PCB designs and also started making professional designs for the front panels. Now, after many iterations of my designs, I feel that my modules are ready be used by other people around the world. Tindie seemed to be the right place to start...
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Jeremy | Jan. 26, 2022
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