DESCRIPTION ir3109 is a quad OTA integrated circuit (DIP16) voltage controlled filters VCF , developped in the 80' by International Rectifier for Roland synthesizers and modules. It has been featured in many historical machines and have a very pleasant sound. Today it is quite difficult to find one a good price, but some companies have managed to clone some new batches. Here's the list of IR3109 machines:
| Model | Type | Model |
|---|---|---|
| Jupiter 8 | Synthesizer | - |
| Jupiter 6 | Synthesizer | - |
| Jupiter 4 | Synthesizer | only on second release |
| Promars | Synthesizer | only on second release |
| Juno 6 | Synthesizer | - |
| Juno 60 | Synthesizer | - |
| Jx3p | Synthesizer | - |
| Juno 106 | Synthesizer | encapsulated on 80017a |
| Mks 30 | Module | encapsulated on 80017a |
| Mks 80 | Module | Only rev4 |
| Sh101 | Synthesizer | - |
| MC202 | Module with sequencer | - |
| HS60 | Synthesizer | encapsulated on 80017a |
| JUNO106S | Synthesizer | encapsulated on 80017a |
The IR3109 contains four variable transconductance amplifiers designed for VCF applications in electronic musical instruments.
The device is equipped with four high input impedance buffers, and anti-log circuitry ( V-in to I-out) which controls conductances of four amps.
- wide transconductance variable range (1 μ ℧ -10 ℧ )
- low input offset voltage ( less than +- 3mV) (transconductance amplifier)
- high input impedance MOS P-channel (buffer)
Roland ir3109
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