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AM2340 Module - Eµ VC Lag Processor
Overview This module is a clone of the Voltage Controlled Lag Processor in the Eµ Modular. It has two modes, linear and exponential, which can be continuously varied between. In
linear mode the module acts as a slew limiter, in exponential mode the module acts as a filter. This module is typically used to add slide to control voltages, such as portamento.
Original Circuit
Dave Rossum originally designed the Voltage Control Lag Processsor in 1973 and released the module in January 1974. It was updated in 1976, and its the Rev 2 schematic that is used in this clone. This module is relatively simple to build. The circuit uses 1458 Op Amps (its all control voltages), a CA3046 transistor array and the rare AD820 matched transistor pair for the exponential response.
AM Circuit The same design is used for the replica, with the AD820 mounted on an 8-pin DIL socket so I can use different transistor pairs. I have kept the same 1458 Op Amps in the prototype but modern Op AMps can be used.
Panel The front panel is a standard AM design, 90mm wide and 4U high, with black lettering. Controls knobs are standard Eµ Modular designs.
Build History The schematic was transfered into Eagle CAD on 31/12/03. Waiting on board layout and manufacture.
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Resources
* Front Panel .fpd file
* MP3 Demo