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AM3310 Module - ADSR Envelope Generator
Overview The
CEM3310 of 1979 was the first of a new generation of synthesizer chips introduced by Doug Curtis. It's snappy envelopes formed the basis for many analog polysynths over the next five years including the SCI Prophet 5 Revision 3, the
Oberheim OB8 and the awesome PPG Wave 2.0. It was eventually replaced by micro-processor generated envelopes, which struggled to achieve the fast attack times of a dedicated chip until processor speeds increased in the late 80's.
AM3310 Module The design is based around the Digisound design which is more sophisticated than the usual basic polysynth implementation. The module provides voltage control of the envelopes, and positive and negative
envelopes at modular control levels. It also implements trimming of the sustain level to ensure it matches the peak level.
There is a manual trigger button as well as a red LED for when the Gate is on and a blue LED for when the
attack phase is active. The circuit has been carefully checked to ensure the minimum attack times are below 2ms, to get that snappy feel.
Front Panel The front panel is made from PCB material, spray painted with
car aryclic paint and then black lettering printed on Safmat which is applied to the final painted surface. The technique is described here >>
The panel is 4U high, 90mm wide and has ARP 2500 like control knobs and 1/8" jack
sockets.
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