Eurorack VCO 1 (Version 1.0)
Electronic Druid website has several CEM3340 VCO (Voltage Controlled Oscillator) designs.
The original CEM3340 VCO was used as a start and modified to include more features.
The circuit is compatible with eurorack modules (+/- 12V).
After getting an idea on the desired functionalities, input and outputs, the circuit was built on protoboards.
During design stage, Fusion 360 and KiCad were used to model the board and get an idea on how the board would look like.
This module has 2 PCB boards (PCB A and PCB B) and 1 Panel board.
- 2 voltage/octave
- Exponential FM
- Linear FM
- Sync (Hard and Soft)
- Coarse (Frequency)
- Mix Out
The boards were manufactured by JLCPCB.
Assembled in house.
- The EngrEDU VCO 3340 is attached to the TipTop audio Eurorack and it is powered by the TipTop audio uZeus
- Oscilloscope: Keysight MSOX3012T – 100MHz @ 5GSa/s
- All waveforms were tested and plotted using the oscilloscope. The graphs will show peak to peak, maximum and minimum voltage.
Pulse Wave – 0% PWM
Pulse Wave – 50% PWM
Pulse Wave – 100% PWM
Mix Out – All Waves Off
Mix Out – Square Wave
Mix Out – Triangle Wave
Mix Out – Sine Wave
Mix Out – Pulse Wave – 0% PWM
Mix Out – Pulse Wave – 50% PWM
Mix Out – Pulse Wave – 100% PWM
Mix Out – Sawtooth Wave
Mix Out – Random Wave
Mix Out – “Maximum” Wave