LOWPASS 02A

The 02A is a 24db low-pass filter based on the classic "transistor ladder" originally designed by Robert Moog. This version is a faithful re-creation of the filter found in the Mini Moog

Input
The filter input level is adjusted using the gain control attenuator. Moderate gain settings provide the smoothest sound but higher gain settings are better for high resonance sounds.

1V/Oct Input
Exponential converters track linear voltage input at 1 volt per octave. This input is primarily used for keyboard tracking and pitch control of filter in self-oscillation mode.

CV Input 1
Control Voltage input with attenuator
to control the depth of frequency modulation.
When the knob is centered no modulation occurs. Positioning the knob to the left of zero inverts the incoming voltage (negative) and to the right the voltage is non-inverted (positive).

CV Input 2
Secondary Control Voltage input with attenuator.
CV inputs are used to control the filters cutoff point.
The most common input signal would be from an envelope generator or LFO.

Resonance Control
This knob varies the height of the resonant peak at the cutoff frequency of the filter.

Separate Attenuator Section
These are simple passive attenuators useful for limiting the amount of signal being passed to a modules inputs. They are available on this module to fill remaining space left by the filter

Specifications:
Wide-range lowpass filter with variable-height
resonant peak at cutoff frequency.
4 pole response
24db/oct cutoff slope
Range:Continuously variable from 40Hz-20kHz
Input impedance: 47K ohms
Output impedance: 1k ohms
Control Sens: 1 volt per octave