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Roland IR3109 VCF IC in DIP16 package.

The IR3109 was a VCF IC produced by International Rectifier for Roland Corporation. It is essentially four independent buffered OTAs which can be interconnected to provide a variety of filter responses, and a single input exponential frequency control.[1][2]

Synthesizers etc. using the IR3109


DIY projects

  • AMSynths AM8060
  • AMSynths AM8109
  • Mutable Instruments Shruthi-1 IR3109 filter board

See also


  1. ^ AS3109 data sheet, Alfa Rpar
  2. ^ reverse engineering the IR3109, Mod Wiggler Forum, Nov 2014
  3. ^ a b Roland Filters by Florian Anwander

External links

  • AS3109, SOIC-16 IR3109 clone by Alfa Rpar