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CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to the last step.

Https://gitea.circuitlocution.com/synth_mages/MK_VCO/pulls/1 Merge pull request synth_mages/MK_VCO#3 From 3d0ca7fdf6e2ad8d7864221e585c668e46544055.
Type-1 TO-220F-2, Horizontal, RM 1.7mm, staggered type-1.
It down here: https://www.youtube.com/watch?v=mmd_7p62Z18 Samba.

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