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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 http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, 27.0x27.0mm, 756 Ball, 32x32 Layout, 0.8mm Pitch, https://www.micron.com/-/media/client/global/documents/products/data-sheet/dram/ddr3/4gb_ddr3l.pdf#page=24 FBGA-78, 10.5x8.0mm, 78 Ball, 9x13 Layout, 0.8mm Pitch, http://www.latticesemi.com/view_document?document_id=213 WLCSP-16 2.225x2.17mm, 2.17x2.225mm, 16 Ball, 4x4 Layout, 0.5mm Pitch, DSC0010J, WSON, http://www.ti.com/lit/ds/symlink/tps61201.pdf Plastic Small Outline (SO) (http://www.everlight.com/file/ProductFile/201407061745083848.pdf 5-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm Body [QFN] with corner pads; see figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf 20-Lead Plastic Thin Quad Flatpack (PT) - 10x10x1.0 mm Body [SOIC] (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf SOIC, 8 Pin (JEDEC MO-241/VAB, https://assets.nexperia.com/documents/package-information/SOT763-1.pdf), generated with kicad-footprint-generator Soldered wire connection, for 4 times 2.5 mm² wires, basic insulation, conductor diameter 1.7mm, outer diameter 1.7mm, outer diameter 1mm, 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 JST ACH vertical JST XH series connector, DF52-12S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator JST EH series connector, B7B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, B10B-J21DK-GGXR (http://www.jst-mfg.com/product/pdf/eng/eJFA-J2000.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py AMS OLGA, 8 Pin (JEDEC MO-153 Var AD https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 4 times 1.5 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 2.7mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_312051_RT045xxUBLC_OFF-022759T.pdf, script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00076 pitch 7.5mm Varistor, diameter 21.5mm, width 5.4mm, pitch 7.5mm size 15x9mm^2 drill 1.3mm pad 2.5mm Terminal Block Phoenix PT-1,5-14-3.5-H, 14 pins, pitch 5mm, size 60x7.6mm^2, drill diamater 1.4mm, pad diameter 3mm, see , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type094_RT03504HBLU pitch 5mm size 15x9mm^2 drill 1.3mm pad 2.6mm Terminal.

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