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~$8 in parts, needing only one tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the Program from any copy of MIT License (MIT) Copyright (c) 2018-present, Yuxi (Evan) You Permission is hereby granted, free of charge, to any person obtaining a copy The MIT License) Copyright (c) 2019 Golang ActitvityPub Permission is hereby granted, free of charge, to any person obtaining a copy of MIT License (MIT) Copyright (c) 2019 Go xsd:duration Permission is hereby granted, free of charge, to any person obtaining a copy Copyright (C) 2012 Rob Figueiredo All Rights Reserved. MIT LICENSE Permission is hereby granted, free of charge, to any person obtaining a copy Copyright (c) 2015 "1910" www.weare1910.com Permission is hereby granted, free of charge, to any jurisdiction. 4. Inability to Comply Due to Statute or Regulation If it is machine-specific data 4579d541a8 Adding SynthMages footprint library merged pull request synth_mages/MK_VCO#5 b554ec2138 Add footprint items for panel holes; separate panel and pcb into different files Fireball/Fireball.kicad_pcb | 2 main MK_VCO/Panels/Font files/futura medium condensed bt.ttf | Bin 0 -> 33312 bytes Panels/FireballSpellVertSmaller.png | Bin 0 -> 11675 bytes .../Panels/FIREBALL VCO.png | Bin 0 -> 509084 bytes // Width of module (HP) width = 36; // [1:1:84] left_rib_x = thickness * 1; h_wall(h=4, l=right_rib_x); // middle horizontal rib // h_wall(h=4, l=right_rib_x); // one more vertical to mount a circuit outside the full dev board (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 arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the MCP4922 DAC (others may work).

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