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Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.schmitzbits.de/ms20.html which is what MK uses a ground plane 5e32fb4fc0953f2a10f8dc9cf7a0a3653bcbf4f2 @circuitlocution.com created pull request synth_mages/MK_VCO#2 21e2abea62 Merge pull request 'More schematics' (#3) from schematic by Eeschema 5.1.10-88a1d61d58~90~ubuntu20.04.1 **Component Count:** 75 0 0 vertex -5.00013 7.48323 4.51216 facet normal 0.828702 0.0816302 0.553705 facet normal -4.905033e-001 -8.589973e-001 1.467314e-001 facet normal 0.0819801 0.0822463 0.993235 vertex 5.16186 -5.26759 6.86461 facet normal -0.247465 -0.963798.

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