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AM3372 - Oberheim Matrix 12 VC Filter
Overview This module is designed around the CEM3372 VCF chip which featured in the Oberheim Matrix 12 and Expander synthesizers in the mid-1980's. The filter can be configured in 15
different ways, providing a nice variety of Low, Band and High Pass filters at various poles.
The idea of basing a module around the CEM3372 Matrix 12 VCF implementation is not new. Jesper Erwik Johansson in Sweden developed such a
module in 1998, and sold a limited edition of 12. Jesper added some interesting features, such as a front panel display of filter type and the ability to clock through the filter modes. He also made use of the two VCA's on the input side
of the filter core.
Doepfer also have a version of this filter, using Jespers ideas and then some more. They have added the ability to morp between filter modes, and added another 16 filter types. This is a micro-controller based
implementation.
AM Module
The AM3372 is based on the Matrix 12 implementation of the filter chip with the standard 16 filter modes. A separate clock module provides sequential or random control of the filter types. A 3 charcter LED display shows the filter type in hex.
Build Status Work on this module is in progress.
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 FAQ's
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 * Analog Metropolis - FAQ's
 * Building AM Modules - FAQ's
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Resources |
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* OBERHEIM FILTER
Here is a description of the Oberheim filter from the Expander
Service Manual..
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* ERWIK FILTER more »
Jesper doesn't seem to have a web site, but there are some details of his
Matrix 12 filter.
* DOEPFER MODULE more »
The A107 Module details are on their web site.
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AM4372 Filter |
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