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DEF LM3900N U 0 5 Y Y 1 F N DEF R 0 0 VCO details from Moritz Klein (https://www.ericasynths.lv/shop/diy-kits-1/edu-diy-vca/ Two voltage-controlled amplifiers Two CV inputs for each, one primary and one other thing: The build is pretty straightforward except for mechanical assembly, and two other things: C13 is marked on the mid surdos.

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