IR3109

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.

Prebuilt

 * Boss PH-2
 * Boss RPH-10
 * Roland Juno 6/Juno-60/HS-60
 * Roland Jupiter 4/Promar - up to Serial number 800800 matched BA662 with FET buffers, later models IR3109
 * Roland Jupiter 6
 * Roland Jupiter 8
 * Roland JX-3P
 * Roland MC-202
 * Roland MKS-30
 * Roland MKS-80 - until Revision 4, IR-3R05 in Revision 5
 * Roland SH-101

DIY projects

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