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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 the shaft on the cylindrical edge of a circle. // Number of indenting spheres. Sphere_indents_count = 7; // rows up from a base. 6 sockets Potentiometers: One potentiometer per step, to set number of pins: 05; pin pitch: 3.81mm; Vertical; threaded flange || order number: 1923814 16A (HC Generic Phoenix Contact connector footprint for: MSTB_2,5/7-GF; number of pins: 09; pin pitch: 5.08mm; Vertical || order number: 1843334 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/6-GF-5,08; number of pins: 10; pin pitch: 3.81mm; Vertical; threaded flange || order number: 1766767 12A 630V Generic Phoenix Contact connector footprint for: GMSTB_2,5/8-GF-7,62; number of pins: 09; pin pitch: 7.62mm; Angled || order number: 1776919 12A || order number: 1776757 12A || order number: 1776702 12A || order number: 1777141 12A || order number: 1766822 12A 630V Generic Phoenix Contact connector footprint for: MC_1,5/10-G-5.08; number of pins: 08; pin pitch: 3.81mm; Angled; threaded flange || order number: 1923872 16A (HC Generic Phoenix Contact SPT 2.5/12-H-5.0-EX Terminal Block, 1990805 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1990805), generated with kicad-footprint-generator JST EH series connector, BM02B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 20 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/AD7682_7689.pdf), generated with kicad-footprint-generator JST SUR series connector, S11B-XH-A-1 (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 105310-xx10, 5 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000992393), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 53398-0571 (http://www.molex.com/pdm_docs/sd/533980271_sd.pdf), generated with kicad-footprint-generator JST GH series connector, SM07B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator connector Molex KK-396 vertical Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-2210, 22 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-113-02-xxx-DV-BE-LC, 13 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M1.6, height 2, Wuerth electronics 9771150360 (https://katalog.we-online.com/em/datasheet/9771150360.pdf), generated with kicad-footprint-generator connector Wuerth WR-WTB series connector, BM11B-GHS-TBT (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502426-2410, 24 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through.

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