CubuSynth - Dual CS-20 VCF (DIY)

Difficulty Level: 6/10
Build Time: 3 ~ 6 hours
Two PCB-Sandwich, normal component count, easy to solder & assemble
Component count: 172

Key features

- 2 individual Filter cores with common Frequency and Resonance controls
- CV control over Frequency and Resonance for each Filter core
- self-oscillating Resonance with LED feedback circuit (visible on the Front)
- 1 V/oct input, tracking over 2~3 octaves
- Frequency Range: 22 Hz – 20 kHz
- Blend between LP / HP Filter modes
- Ability to use as 2 pole (12db) stereo HP/LP Filter, 4 pole (24db) mono LP/HP or a Band Pass (12db) Filter
- Cross FM Modulation possible

Dual / Stereo Multimode VCF with Self-oscillating Resonance and intuitive Routing and CV modulation Matrix

The CubuSynth Dual CS-20 VCF is a versatile module that combines two 12db filter cores in a dual/stereo configuration. It is inspired by the iconic Korg MS-20 synthesizer, offering similar sound characteristics while the resonance can be pushed even further.

The module provides multiple filter modes, including low pass and high pass, which can be blended together to create a diverse range of filter responses. This allows you to shape your audio signal in various ways, from smooth and warm low pass filtering to more aggressive high pass filtering.

One of the standout features of the CS-20 VCF is its self-oscillating resonance capability. When the resonance is turned up, the filter produces a sine wave that can be used as an additional sound source. This feature adds to the versatility of the module, allowing you to create complex and evolving sounds and even cross-FM modulation possibilities.

The frequency and resonance parameters can be controlled via control voltage (CV) inputs. The frequency CV input can be attenuverted, meaning it can both attenuate and invert the incoming CV signal. This gives you precise control over the modulation depth and direction for frequency modulation.

The resonance CV input includes an attenuator, allowing you to adjust the modulation depth for the resonance parameter. This feature gives you the flexibility to add dynamic and expressive modulation to your sounds.

Additionally, the CS-20 VCF provides a 1V/Oct input, which allows you to control the filter's frequency using a standard 1V/Oct control voltage. This input is stable over a range of at least 2 to 3 octaves, ensuring melodic tracking and integration with other modular synthesizer components.

Overall, the CubuSynth Dual CS-20 VCF offers a powerful and flexible filtering solution with intuitive routing and modulation options. It is designed to inspire creativity and provide a wide range of sonic possibilities for your modular synthesizer setup.

Specifications

- Size: 10HP x 3U / 50mm x 129mm
- Depth: 24mm (measured from the front panel)
- Max. Current Draw:
+12V: +19mA
-12V: -19mA

 Modulargrid

PCB+Panel pack contains:

- Main PCB
- Control PCB
- Front Panel

The Full DIY contains all components and PCBs to build the Module