3340 Mini VCO / Eurorack / PCB and Front Panel

3340 Mini VCO

The 3340 Mini VCO Eurorack PCB and Front Panel Kit is a compact, feature-rich voltage-controlled oscillator designed around the legendary CEM3340 / AS3340 core. Offering classic analog waveforms in a space-saving 6HP format, this mini VCO delivers stable tuning and unmistakable vintage character while remaining affordable and approachable for experienced DIY builders.

Designed as a streamlined alternative to full-featured 3340 oscillators, the Mini VCO focuses on essential functionality without sacrificing sound quality or modulation flexibility.

Key Features

• Eurorack PCB and front panel kit
• Based on CEM3340 / AS3340 VCO IC
• Compact 6HP design
• Two simultaneous waveform outputs
• Square / Pulse output with adjustable pulse width
• Triangle or Ramp output, selectable via onboard jumper
• Pulse Width CV input with dedicated amount control
• Stable analog oscillator core with classic sound character
• Front panel made from PCB material, hand screen printed

Waveforms & Sound Character

The 3340 Mini VCO provides two versatile waveform outputs:

• Square / Pulse wave for rich harmonics and classic subtractive synthesis
• Triangle or Ramp wave, selectable via jumper, allowing smooth tones or brighter, harmonically rich textures

This flexible output configuration makes the module suitable for bass lines, leads, FM experiments, and modulation duties.

Pulse Width & CV Control

A dedicated Pulse Width (PW) potentiometer allows precise shaping of the square wave. When a control voltage is patched into the PW CV input, the PW knob functions as a CV amount control, enabling dynamic modulation from LFOs, envelopes, or sequencers for evolving and expressive sound design.

Compact, Affordable & DIY-Friendly

Designed with efficiency and accessibility in mind, the 3340 Mini VCO delivers the unmistakable sound of the 3340 oscillator in a smaller footprint and at a lower cost than full-sized designs—without compromising stability or musicality.

This module is well suited for intermediate to advanced builders looking to expand their oscillator lineup with a reliable, classic analog voice.

Technical Specifications

• Format: Eurorack
• Width: 6HP
• Skill Level: Intermediate / Expert
• Core IC: CEM3340 / AS3340
• Waveforms: Square/Pulse, Triangle or Ramp (jumper selectable)

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Compatible items such as knobs, potentiometers, jack sockets, and other build components can also be found in the Synth Parts category.