Serge Universal Slope Generators (DUSG)
The Dual Universal Slope Generator (DUSG) is one of the main modules that make Serge unique. Everyone should have at least one, it can be used as an LFO or Audio VCO, Transient Generator, Envelope Follower, LP Filter, or Divider among many other things. It can even be patched up to be an ADSR. A synth all by itself when used with multiple DUSGs
From the Serge Catalog: “The Universal Slope Generators are unity gain Voltage Followers with voltage controllable slopes. The range of control is exponential, extremely wide and the Rise and Fall times can be controlled independently.”
The module has been copied widely and goes by multiple names by other manufacturers.
My Serge DUSG was bought as a semi-kit from SMMS (Serge Modular Music Systems) in the early 1980’s. I also built a second module with a Ken Stone/CGS circuit board.
Ken Stone has discontinued his web site and moved information and sales of his boards to Elby Designs. All Serge designs that Ken made available (with authorization by Serge and royalties) have been transfered to Elby under the same agreement.
Serge modules are available from these sources:
Random*Source: Serge Tcherepnin is the “Chief Innovation Officer” for Random*Source and they are currently producing classic modules and new designs. Currently there’s no DIY option to build thier designs.
Elby Designs: Ken Stone’s Serge boards are now available at Elby.
Prism Circuits: Serge Paperface modules are available to DIY. The focus is on early 6 row designs and the paperface build style.
Loudest Warning: Custom builds in Loudest Warning format and full panels. Panels are also available for DIY.