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Category: Phaser

Roland filter designs with the IR3109 or AS3109

Posted on May 27, 2025August 28, 2025
AS3109 Datasheet filter schematic

We’ve recently started stocking Alfa’s clone of the famous old Roland IR3109 filter chip. This is the chip that was inside a ton of Roland synths, including the SH-101, Jupiter 6 and Jupiter 8, Juno 6/60 and even the Juno 106, although in that case it was hidden in a potted module! I thought it’d […]

Posted in Filters, Juno, Jupiter 6, Jupiter 8, Phaser, Roland, SH-101, Synth DIY, Vintage synths   6 Comments on Roland filter designs with the IR3109 or AS3109

Electric Druid

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Druid code and schematics are released under a CC BY-NC-SA 4.0 license, so feel free to download and use Electric Druid code in your personal synth, pedal, or sonic blastertron 2000. Grab a copy of the schematics and tweak away to your heart’s content. If you don’t have a PIC programmer, you can order a chip from the shop. Check the legal stuff for more details.

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Electric Druid code and schematics are released under a CC BY-NC-SA 4.0 license. Please check the legal stuff for more details. If you’d like to use Electric Druid chips, code, or circuits in your commercial product, we’d ask that you buy chips from us to help support the development of further projects. We can supply programmed, labelled chips in whatever quantities you need. If this isn’t suitable, please contact us to discuss your requirements. Thanks!