3340 VCO (Eurorack Voltage Controlled Oscillator)

This is a basic circuit design from CEM3340 datasheet. It was widely used in the 80s by many synth manufacturers such as Roland and Oberheim. Its hand build with good quality components and AS3340 IC (equivalent of CEM3340). Front panel is also hand printed. This is a 10HP eurorack synth module.

It can generate 3 different wave forms (Square, Triangle and Ramp). It has hard sync and soft sync inputs, Linear Frequency Modulation input and also 1 volt per octave input with solid tracking. Pulse width can also be adjusted for square wave and it can also be modulated with external cv.


3320 VCF (Eurorack Voltage Controlled Filter)

This module is a typical voltage controlled low pass filter design based on CEM3320. It is hand built with good quality components and AS3320 (CEM3320 equivalent). It can create from low rubbery bass to high resonance screaming synth sounds. It is a simple design with audio I/O, CV in, CV amount, resonance and the cutoff frequency. 3320 design was used in the 80s by many synth brands such as Oberheim, Sequencial One just to name a few.




Both units are available on ebay as built unit and also PCB and Front Panel only option for DIY.

3340 VCO:
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