Stable CEM3340/AS3340 based VCO for Eurorack

Chipset Contains:
Useful Documents
Build Document


CEMosc is a stable AS3340 based VCO which tracks beautifully, and is feature rich. Easy to build and calibrate too.

CEMosc has at it’s heart a CEM3340 or AS3340. You can source your own chip, of buy AS3340 direct from me when you order your PCB set and panel.

CEMosc features:

  • Onboard voltage regulation for tuning and tracking stability
  • A rotary octave switch as well as a fine tune knob
  • Both manual PW as well as PWM are available
  • Linear and Exponential FM inputs, each with attenuators
  • Both soft and hard sync
  • Sawtooth, Triangle and Pulse outputs

Additional information



12V draw

-12V draw

5V draw