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(in some cases) 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 either internal or external clock signal, start/stop, manual step button in Unseen Servant functions More traces and vias, and net links 06eccf7d9c added the once through idea with commentary by Latest commits for file Schematics/MK_VCO_RADIO_SHAEK_try1.diy Binary files /dev/null and b/Panels/futura light bt.ttf differ Latest commits for file Images/adsr.png Repo uses submodules.

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