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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 this one, but many external clock sources cycle between 0v and 5v max // gate out (j4/j10 // clock out (j5/j12) // glide atten (rv15 // glide atten (rv15 // glide manual (rv16 // 1 to 4.9 milli Ohm (http://http://www.vishay.com/docs/30108/wsk.pdf Shunt Resistor SMD 0402 (1005 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 502585-1070 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 4.5, Wuerth electronics 9774070943 (https://katalog.we-online.de/em/datasheet/9774070943.pdf), generated with kicad-footprint-generator JST XH side entry Molex Mini-Fit Jr. Power Connectors, 43915-xx14, 7 Pins (http://www.molex.com/pdm_docs/sd/559320210_sd.pdf), generated with kicad-footprint-generator Molex Pico-Lock series connector, S5B-EH (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Molex Pico-Clasp series connector, S10B-XH-A-1 (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 20 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_20_05-08-1742.pdf), generated with kicad-footprint-generator connector JST J2100 series connector, B18B-PUDSS (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, 502585-0770 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, S12B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502426-6010, 60 Pins (http://www.molex.com/pdm_docs/sd/555600207_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 3.5, Wuerth electronics 9771120360 (https://katalog.we-online.com/em/datasheet/9771120360.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-148-02-xxx-DV, 48 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000994748), generated with kicad-footprint-generator connector Molex SPOX horizontal Molex Pico-Lock horizontal Molex JAE 0.2mm pitch, 1mm overall height FFC/FPC connector, FH12-11S-0.5SH, 11 Pins per row (https://www.hirose.com/product/en/products/DF63/), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-132-02-xx-DV-TE, 32 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 16 Pin (http://www.ti.com/lit/ds/sbos354a/sbos354a.pdf, JEDEC MO-220 variation VJJD-2), generated with kicad-footprint-generator JST PHD series connector, B7B-EH-A (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DFN8 2x2, 0.5P; No exposed pad Micrel MLF, 8 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/8L_DFN_2x3x0_9_MC_C04-123C.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 64 Pin (http://www.ti.com/lit/ds/symlink/msp430f5217.pdf#page=120), generated with kicad-footprint-generator JST ZE series connector, DF52-10S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 48 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation BC), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-0530, 5 Pins (http://www.molex.com/pdm_docs/sd/559350530_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 0.25 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 2.1mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend.

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