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PCB layout: [front](Docs/precadsr_layout_front.pdf), [back](Docs/precadsr_layout_back.pdf) * [BOM](Docs/precadsr_bom.md) * [Build notes](Docs/build.md) How to use the 4 pins (http://www.qingpu-electronics.com/en/products/WQP-PJ320D-72.html 3.5mm jack mic microphone phones headphones 4pins audio plug Headphones with microphone connector, 3.5mm, 4 pins (http://www.qingpu-electronics.com/en/products/WQP-PJ320E-177.html PJ31060-I 6pin SMD 3.5mm headphones jack plug stereo 3.5mm PJ311 Headphones with microphone connector, 3.5mm, 4 pins RGB RGBLED LED, Round, FlatTop, Rectangular size 5.0x2.0mm^2 z-position of LED center 1.0mm 2 pins Ceramic Resomator/Filter 7.0x2.5mm^2, length*width=7.0x2.5mm^2 package, package length=5.5mm, package width=3.0mm, 3 pins Ceramic Resomator/Filter 10.0x5.0mm^2 RedFrequency MG/MT/MX series, http://www.red-frequency.com/download/datenblatt/redfrequency-datenblatt-ir-zta.pdf, length*width=10.0x5.0mm^2 package, package length=6.0mm, package width=3.0mm, 3 pins LED, , diameter 1.8mm size 1.8x2.4mm^2 z-position of LED center 2.0mm, 2 pins, color: clear IR infrared LED with right hand decimal, https://docs.broadcom.com/docs/AV02-1589EN 2 Digit 7 segment LCD 6 digit 7 segement blue LED with left dot Overflow +- 1 red LED with photo IC package for Siemens SFH900 reflex photo interrupter SMD PhotoDiode, plastic SMD DIL PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467146/SFH%202440_EN.pdf DFN, 6 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_6_3.pdf), generated with kicad-footprint-generator connector JST EH series connector, S02B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.3mm, height 3, Wuerth electronics 97730256332 (https://katalog.we-online.com/em/datasheet/97730256332.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py Kionix LGA, 12 Pin (http://www.ti.com/lit/ds/symlink/ldc1312.pdf#page=62), generated with kicad-footprint-generator Molex CLIK-Mate series connector, S4P-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP I, 32 pins, 18.4x8mm body (https://www.micron.com/~/media/documents/products/technical-note/nor-flash/tn1225_land_pad_design.pdf TSOP-I, 56 Pin (JEDEC MO-153 Var BE https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 3, Wuerth electronics 9774020943 (https://katalog.we-online.de/em/datasheet/9774020943.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Soldered wire connection.

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