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Doepfer Musikelektonik logo

Analogue  Modular  System  A-100

Width

HP

Depth

mm

Current

mA

Lighning Flash

Owners Manual

CEM 24dB/oct  Voltage Controlled Low Pass Filter

The A-122 is a voltage controlled low pass filter which filters out the higher parts of the sound spectrum and allows the lower frequencies to pass through. The cut-off frequency determines the point at which filtering takes effect and can be controlled manually or by voltage control using the two CV inputs.


The cut-off slope is -24dB/octave using a Curtis CEM3320 chip and is very similar to the classic Oberheim filter sound (unlike the A-120 filter which is a “Moog-like” filter). Voltage controlled resonance can be controlled not just manually but by voltages as well, right up to self oscillation. In this case the filter behaves like a sine wave oscillator.




A-122

80

40

10HP

20

10HP

A-122  

Doepfer A-122