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CD4069 CMOS Modular circuits
[Image: NgMos0211.GIF]
[Image: VcfMos0206.GIF]
[Image: VcaMos0210.GIF]
[Image: EfMos0301.GIF]
[Image: LfoMos0211.GIF]
[Image: VcoMos0212.GIF]
Many years ago, Sam(Osamu) Hoshuyama did post on the SDY list a series of designs of his of a basic modular synth all based on CMOS circuits.
You can find it al here :
http://www5b.biglobe.ne.jp/~houshu/synth/index.html