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< 0 } module cherry_mx_button() { union(){ cube([14,14,thickness]); // u[nits] function units_mm(u) = u * U; main synth_tools/PCB Notes.txt 17 lines Notes from MK's PCB livestream Footprints: - avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals - make power connection traces larger; MK uses .6mm -- this is good practice, but ho-dang what a mess a3d4f2b82e romps with traces, vias, and net links 06eccf7d9c added the once through idea with commentary by added the once through idea with commentary by Correcting changed filename in .prl 54f1a61ba5 gets jiggy with PCB locator, 14 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with kicad-footprint-generator JST XH horizontal JST J2100 series connector, BM04B-ACHSS-A-GAN-ETF (http://www.jst-mfg.com/product/pdf/eng/eACH.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 9, Wuerth electronics 9775076360 (https://katalog.we-online.com/em/datasheet/9775076360.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py 4-Lead Plastic Stretched Small Outline Package (MS) [MSOP], variant of TO-92), also known as TO-226, wide, drill 0.75mm (see NXP sot054_po.pdf TO-92 leads in-line, wide, drill 0.75mm (see https://www.diodes.com/assets/Package-Files/TO92L.pdf and http://www.ti.com/lit/an/snoa059/snoa059.pdf TO-92L Inline Wide transistor TO-92Mini package, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S package, drill 0.6mm (https://media.digikey.com/pdf/Data%20Sheets/Infineon%20PDFs/KT,KTY.pdf TO-92S package, 2-pin, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot361-1_po.pdf TSSOP, 28 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=289), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.7mm, height 1.5, Wuerth electronics 97730456332 (https://katalog.we-online.com/em/datasheet/97730456332.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height 5, Wuerth electronics 9771150360 (https://katalog.we-online.com/em/datasheet/9771150360.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, B8P-VH-FB-B, shrouded (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, old mpn/engineering number: 5569-18A2, example for new mpn: 39-28-x06x, 3 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py WSON, 8 Pin (https://ams.com/documents/20143/36005/AS7341_DS000504_3-00.pdf/#page=63 LGA, 8 Pin (https://www.st.com/resource/en/datasheet/l5973d.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, B8B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.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/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator JST SH series connector, B8P-VH-FB-B, shrouded (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 24 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation DD), generated with kicad-footprint-generator ipc_noLead_generator.py Texas Instruments, DSBGA, area grid, YZP, YZP0010, 1.86x1.36mm, 10 Ball, 3x4 Layout, 0.5mm Pitch, http://www.ti.com/lit/ds/symlink/txb0104.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf BGA 12 0.5 R-XBGA-N12 Texas Instruments, BGA Microstar Junior, 7x7mm, 113 ball 12x12 grid, NSMD pad definition Appendix A BGA 225 0.8 CSGA225 Spartan-7 BGA, 15x15 grid, 13x13mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=270, NSMD pad definition Appendix A BGA.

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