3340 VCO Module - Full DIY Kit for Eurorack modular synth

The 3340 VCO Eurorack Full Kit is a DIY voltage controlled oscillator based on the classic AS3340/CEM3340 design, created for Eurorack format systems. This complete kit includes the PCB, front panel, and all required electronic components, making it an ideal choice for builders who want everything included in one package.

To streamline the build process and ensure consistent performance, all basic SMD components are assembled at the factory. The builder completes the module by installing the through-hole (THT) components, offering a satisfying DIY experience without the complexity of SMD soldering.

Key Features

• Complete Eurorack VCO full kit (PCB, front panel, and all components included)
• Factory-assembled SMD components
  
• Square, Triangle, Ramp, and Sine waveform outputs
• Hard Sync and Soft Sync inputs
• Linear FM input with accurate 1V/octave tracking
• External CV control for pulse width modulation (PWM) (0 to +5V)
• 10HP Eurorack format

Included Components

• Eurorack PCB with pre-assembled SMD components
• PCB front panel (black PCB with factory-printed white graphics and gold-plated exposed copper)
• Jack sockets
• Potentiometers
• Control knob
• IDC power socket
• Trimmers
• Timing capacitor
• AS3340 IC
• IC socket
• Eurorack power cable
• Mounting screws 

Modulation & Sound Design

The 3340 VCO provides a broad sonic range, from aggressive, harmonically rich textures to smooth and stable waveforms. With linear FM, multiple sync options, PWM control, and precise pitch tracking, it excels in both traditional analog synthesis and complex modular sound design.

DIY Build & Assembly

The PCB is clearly labeled to assist with assembly and calibration, and the pre-assembled SMD components significantly reduce build time and difficulty. All remaining components are through-hole and straightforward to install.

The front panel is made from high-quality PCB material with a black solder mask, factory-printed white markings, and gold-plated exposed copper, delivering a durable, modern, and professional appearance without screen printing.

Technical Specifications

• Width: 10HP
• Skill Level: Intermediate
• Current Draw: +12V: 15mA, −12V: 15mA

This full kit offers a complete, high-quality build experience and delivers the classic sound and flexibility of a 3340-based Eurorack VCO with a refined, modern aesthetic.