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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 (or derived from) the Program with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, Memory Protection Devices P/N BC2AAPC, http://www.memoryprotectiondevices.com/datasheets/BC2AAPC-datasheet.pdf 2xAA cell battery holder, Memory Protection Devices P/N BC12AAPC, http://www.memoryprotectiondevices.com/datasheets/BC12AAPC-datasheet.pdf BC2003 CR2032 2032 Battery Holder BH-331P Battery Type 3xAAA (Script generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 22-27-2051, 5 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-141-02-xx-DV-PE-LC, 41 Pins per row (https://www.hirose.com/product/en/products/DF63/), generated with kicad-footprint-generator connector JST XH series connector, BM07B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 53261-1771 (http://www.molex.com/pdm_docs/sd/532610271_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py Texas Instruments EUK 7 Pin Double Sided Module Texas Instruments DSBGA BGA YZR0009 Texas Instruments, DSBGA, area grid, NSMD pad definition Appendix A BGA 484 1 FG484 FGG484 Artix-7 BGA, 19x19 grid, 10x10mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f031k6.pdf WLCSP-25, 5x5 raster, 2.423x2.325mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/DM00366448.pdf WLCSP-168, 12x14 raster, 4.891x5.692mm package, pitch 0.4mm; http://www.fujitsu.com/global/documents/products/devices/semiconductor/fram/lineup/MB85RS1MT-DS501-00022-7v0-E.pdf Infineon LFBGA-292, 0.35mm pad, 17.0x17.0mm, 292 Ball, 20x20 Layout, 0.8mm Pitch, https://www.st.com/resource/en/datasheet/stm32mp151a.pdf ST LFBGA-448, 18.0x18.0mm, 448 Ball, 22x22 Layout, 0.8mm Pitch, https://www.nxp.com/docs/en/package-information/98ASA00855D.pdf#page=1 TFBGA-196, 11.0x11.0mm, 196 Ball, 14x14 Layout, 0.75mm Pitch, http://ww1.microchip.com/downloads/en/DeviceDoc/SAMA5D2-Series-Data-Sheet-DS60001476C.pdf#page=2956 FBGA-78, 10.6x7.5mm, 78 Ball, 9x13 Layout, 0.8mm Pitch, https://www.st.com/resource/en/datasheet/stm32h7b3ri.pdf ST TFBGA-257, 10.0x10.0mm, 257 Ball, 19x19 Layout, 0.5mm Pitch, S-PVSON-N10, DRC, http://www.ti.com/lit/ds/symlink/tps61201.pdf 3x3mm Body, 0.5mm Pitch, https://www.ti.com/lit/ds/symlink/sn74lvc1g17.pdf#page=42, https://www.ti.com/lit/ml/mxbg018l/mxbg018l.pdf BGA 5 0.5 YZP Texas Instruments, BGA Microstar Junior, 2x2.5mm, 12 bump 3x4 (perimeter) array, NSMD pad definition (http://www.ti.com/lit/ds/symlink/tlv320aic23b.pdf, http://www.ti.com/lit/wp/ssyz015b/ssyz015b.pdf Texas Instruments, QFM MOF0009A, 6x8x2mm (http://www.ti.com/lit/ml/mpsi063a/mpsi063a.pdf QFN, 41 Pin (http://www.ti.com/lit/ml/mpqf506/mpqf506.pdf QFN, 28 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=280), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 14110313010xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13010XXX_100228421DRW063C.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-1430, 14 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 Molex Mini-Universal MATE-N-LOK, old mpn/engineering number.

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