The Hungry Robot VCF is an all analog, 4-pole low pass filter with a resonance control. This resonant filter has a beautiful tonal quality. The over-sized knobs provide a satisfying tactile response. The cutoff frequency can be controlled by external control voltage. It has a built-in attenuator and invert switch for the incoming CV. CV input does not track at 1V/Oct, but is scaled to act as a VCA when a 5V signal is applied to CV input. As with all Hungry Robot "Modular Boxes" the VCF can be powered by a simple 9V DC, Negative Center power supply.
*** DISCLAIMER: The VCF was updated in the Spring of 2021 to use a CEM3320 reissue chip. A "STABILITY" trimpot was added internally that is allows you to dial in a less stable, grittier filter sound. Overall, features remain similar to the first units, but there are small differences in sound and response that will be noticed when side by side with the first units. The video demonstration is of the first units***
Controls & Patch Points
-FREQUENCY: Sweeps the cutoff frequency of the filter.
-CV: Attenuator for incoming CV input.
-RESONANCE: Sets resonance of filter. Small volume drop is to be expected.
-INVERT: Inverts the incoming CV input. Toggle to the right to invert incoming CV
-IN: Patch Audio Signal In
-CV: CV input for Frequency. Allows for CV control of this parameter.
-OUT: Patch Audio Signal Out
Dimensions: 4.7” x 2.6”
Power (Through Hole Units): 9V DC - Negative Center - 2.1mm Barrel
Power (Surface Mount Units): 9V-12 DC - Negative Center - 2.1mm Barrel
In the Spring of 2021, we transistioned to a new PCB design with a more efficient power circuit. This allowed for more flexibility in supply voltages. A quick look at the components under the back panel can determine which model you have.