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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 ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else use a modified version of bornier6 Terminal Block WAGO 236-105, 45Degree (cable under 45degree), 2 pins, diameter 5.0mm z-position of LED center 2.0mm 2 pins diameter 5.0mm 2 pins LED diameter 10.0mm Neosid SD12k style2 Inductor, Radial series, Radial, pin pitch=15.00mm, , length*width=16.5*6mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 7.62mm length 16.51mm width 11.43mm Pulse KM-2 L_Toroid, Vertical series, Radial, pin pitch=10.00mm, , diameter*width=8*5.0mm^2, Capacitor, http://www.vishay.com/docs/28535/vy2series.pdf C Disc series Radial pin pitch 12.5mm length 5.1mm diameter 3.1mm C, Axial series, Axial, Horizontal, pin pitch=25mm, , length*diameter=19*8.0mm^2, http://cdn-reichelt.de/documents/datenblatt/B300/STYROFLEX.pdf C Axial series Axial Vertical pin pitch 7.62*12.70mm^2 length 16.13mm width 16.13mm Pulse LP-44 Self Ferrite 14 - 08 Self Ferrite 14 - 08 Self Ferrite 14 - 08 Self Ferrite 14 - 08 Self Ferrite 14 - 18 L_Toroid, Horizontal series, Radial, pin pitch=5.00mm, , length*width=7*2mm^2, Capacitor C Rect series Radial pin pitch 27.50mm length 31.5mm width 15mm Capacitor C, Rect series, Radial, pin pitch=7.00mm, , diameter=13.5mm, Fastron, 09HCP, http://cdn-reichelt.de/documents/datenblatt/B400/DS_09HCP.pdf Inductor Radial series Radial pin pitch 35mm length 29mm diameter 13mm Electrolytic Capacitor C Radial series Radial pin pitch 2.50mm 5.00mm length 7.2mm width.

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