The voltage controlled filter is the prime method of filtering the harmonics of the input audio signals. The M²Synth has a number of filter choices:

• VC LPF 110 A low pass filter (attenuates higher frequency harmonics) with a 3-channel input mixer. Width 2U.
• VC LPF 116 A mini version of the low pass filter 110 without the 3-channel mixer. Width 1U.
• VC HPF 111 A high pass filter (attenuates lower frequency while passing higher frequency harmonics). Width 1U.
• VC BPF 113 A band pass filter that attenuates frequencies above and below the centre frequency passing only a narrow band of frequencies). Width 1U.
• VC BRF 114 A band reject (notch) that attenuates a narrow band of frequencies while passing frequencies above and below the centre frequency - opposite of the band pass filter. Width 1U.
• VC APF 115 A filter that passes all frequencies but varies the phase of the input signal at different frequencies in a non-linear way. Width 1U.
• VC SVF 112 A state variable filter that is 4 filters in 1 LPF, HPF, BPF & APF that can be used in combination of series / parallel for complex filtering effects.

Overview 

The voltage controlled 4-pole all pass filter passes all frequencies but creates a phase shift as the cut-off frequency is swept. Used as a basis in phase shifter modules like our phaser 149. 

Features 

• 1 Volt / Octave cut-off frequency CV)
• Cut-off modulation input with potentiometer attenuator (FM)
• Resonance potentiometer control with external CV control, self-oscillation at around 85% resonance

Specification

• Supply voltage +/-12Vdc
• Supply current  +13mA / -16mA
• Waveform levels +/-5V
• Frequency range: 10Hz to 8kHz with no external CV applied
• Main PCB dimensions 43.5x130mm

Kit contents

Each kit contains

• Main PCB
• Jack socket PCB
• All electronics components, IC sockets and power socket
• 100mm long Power lead 
• Potentiometers, knobs and jack sockets
• Front panel assembly (faceplate and 3mm aluminium back panel)
• Fixings