AM1025 OBIE Xa Filters

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OVERVIEW The AM1025 module is a recreation of the 2 and 4 pole filters in the Oberheim OB-X, with the 4-pole filer having optional Q compensation. The filter uses two AS3320 filter chips to produce an amazing sounding VCF.

 

The 2-pole filter is a state variable, reminiscent of the Oberheim SEM, with both low pass and high pass outputs. The 4-pole filter is a classic 24dB OTA low pass.

DESCRIPTION The filter has two audio signals inputs with level control (INA, INB), frequency cutoff and resonance controls, along with three frequency modulation controls (CV1, CV2 , CV3). There is also a dedicated keyboard input for controlling the filter cutoff from a pitch signal.

Front panels slide switches control which filter mode is provided at the main output, and whether the 4-pole flter is Q compensated:

 

• 2-pole/4-pole low pass
• Q Compensation ON/OFF

 

There is also a dedicated output for the 2-pole high pass filter mode.

 

CONNECTIONS There are six 3.5mm jack sockets mounted on the bottom of the panel;

 

• Signal Inputs (x2)
• CV Inputs (x3)
• Keyboard Input
• Signal Outputs (x2)

 

The module comes with a 10-pin power cable and a set of mounting screws and washers (M3 silver).

MODULE STATUS: IN PRODUCTION