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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 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 fuse holder, car blade fuse mini, http://www.keyelco.com/product-pdf.cfm?p=306 Fuseholder, 5x20, closed, vertical, Bulgin, FX0456, https://www.bulgin.com/products/pub/media/bulgin/data/Fuseholders.pdf Fuseholder 5x20 closed vertical Bulgin FX0456 Sicherungshalter Fuseholder, 5x20, closed, vertical, Bulgin, FX0456, https://www.bulgin.com/products/pub/media/bulgin/data/Fuseholders.pdf Fuseholder 5x20 closed vertical Bulgin FX0456 Sicherungshalter Fuseholder, 5x20, closed, vertical, Bulgin, FX0456, https://www.bulgin.com/products/pub/media/bulgin/data/Fuseholders.pdf Fuseholder 5x20 closed horizontal Shock-Safe Fuseholder, 5 x 20 mm fuse holders; Vertical w/ Stability Pins; 250V; 6.3-16A (http://www.cooperindustries.com/content/dam/public/bussmann/Electronics/Resources/product-datasheets/Bus_Elx_DS_2118_HB_PCB_Series.pdf Fuseholder horizontal open, 5x20mm, 500V, 16A, Schurter 0031.8201, https://us.schurter.com/bundles/snceschurter/epim/_ProdPool_/newDS/en/typ_OGN.pdf Fuseholder horizontal open, 5x20mm, 500V, 16A (https://us.schurter.com/bundles/snceschurter/epim/_ProdPool_/newDS/en/typ_OGN-SMD.pdf Fuseholder horizontal open, 5x20mm, 500V, 16A (https://us.schurter.com/bundles/snceschurter/epim/_ProdPool_/newDS/en/typ_OGN-SMD.pdf Fuseholder horizontal open 5x20 Schurter 0031.8201 Fuseholder 5x20mm closed horizontal Shock-Safe Fuseholder, 5 x 20 mm row spacing, 22x23x17.53mm (https://katalog.we-online.com/ctm/datasheet/750343373.pdf 28-lead TH, EconoPACK 2, same as Littelfuse_Package_H_XN2MM, https://www.infineon.com/dgdl/Infineon-FS75R07N2E4-DS-v02_00-en_de.pdf?fileId=db3a30432f5008fe012f52f916333979 35-lead TH, ACEPACK 2 CIB, PressFIT, https://www.st.com/resource/en/datasheet/a2c50s65m2-f.pdf 25-lead TH, SDIP-25L, https://www.st.com/resource/en/datasheet/stgips20k60.pdf Valve ECC-83-1 round pins Valve ECC-83-2 flat pins Mini-Pentode, 5-pin, e.g. JAN6418 Valve Mini-Pentode 5-pin JAN6418 Varistor, diameter 21.5mm, width 6.5mm, pitch 10mm size 15.8x8.2mm^2 drill 1.3mm pad 2.6mm Terminal Block Phoenix PT-1,5-7-3.5-H pitch 3.5mm size 21x7.6mm^2 drill 1.2mm pad 3mm Terminal Block WAGO 236-212 45Degree pitch 5mm size 40x7.6mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00248, 9 pins, pitch 5mm, size 40x12.6mm^2, drill diamater 1.15mm, pad diameter 2.4mm, outer diameter 3mm, size source Multi-Contact FLEXI-E 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 26-60-4120, 12 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 Molex PicoBlade series connector, B10B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator TE, 826576-3, 3 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 Hirose DF13 through hole, DF13-07P-1.25DS, 7 Pins per row (http://www.molex.com/pdm_docs/sd/022035035_sd.pdf), generated with kicad-footprint-generator Molex Pico-Clasp series connector, B12B-XH-AM, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Hirose DF12E SMD, DF12E3.0-20DP-0.5V, 20 Pins per row (https://www.hirose.com/fr/product/document?clcode=CL0580-2218-5-05&productname=FH41-30S-0.5SH(05)&series=FH41&documenttype=2DDrawing&lang=fr&documentid=0001001704 Hirose series connector, DF3EA-02P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing⟨=en&documentid=0001163317), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 5 times 2.5 mm² wires, reinforced insulation, conductor diameter 0.5mm, outer diameter 1.5mm, size.

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