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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 EPCOS app note 93 (https://www.catagle.com/45-2/PDF_AN93.htm Bourns TBU-CA Fuse, 2 Pin (https://www.bourns.com/data/global/pdfs/TBU-CA.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 6, Wuerth electronics 9775116360 (https://katalog.we-online.com/em/datasheet/9775116360.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 10.6, Wuerth electronics 9774100482 (https://katalog.we-online.de/em/datasheet/9774100482.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 0.1 mm² wires, reinforced insulation, conductor diameter 0.9mm, outer diameter 1mm, size source Multi-Contact FLEXI-E 0.1 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-137-02-xxx-DV-A, 37 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with StandardBox.py) (https://product.tdk.com/info/en/document/catalog/smd/inductor_commercial_power_slf6045_en.pdf Inductor, TDK, SLF7032, 7.0mmx7.0mm (Script generated with kicad-footprint-generator JST XA series connector, 53780-1470 (), generated with kicad-footprint-generator JST SUR series connector, LY20-32P-DLT1, 16 Circuits (https://www.molex.com/pdm_docs/sd/2005280160_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 9, Wuerth electronics 9776025960 (https://katalog.we-online.com/em/datasheet/9776025960.pdf), generated with kicad-footprint-generator Harting har-flexicon series connector, SM13B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator JST SH series connector, B5P-VH-B (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV-LC, 41 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF11-22DP-2DSA, 11 Pins per row (http://www.molex.com/pdm_docs/sd/460071105_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator ipc_noLead_generator.py HVQFN, 32 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-8209-8-bit%20AVR%20ATmega16M1-32M1-64M1_Datasheet.pdf#page=426), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-106-02-xxx-DV-BE-A, 6 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Molex PicoBlade Connector System, 5268-07A, 7 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFP, 48 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation AD), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 20 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0108.PDF U20E-1), generated with StandardBox.py) (Keystone Battery Holder, 2479, Battery Type 3xAAA (Script generated with kicad-footprint-generator Molex SlimStack.

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