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From MK's PCB livestream - avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals 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-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 3.3x2.4mm^2 diameter 1.8mm, 2 pins LED, diameter 5.0mm, 2 pins, diameter 1.8mm 2 pins LED diameter 20.0mm 2 pins diameter 3.0mm 2 pins diameter 5.0mm THT rectangular pad as test point, loop diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00287_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block WAGO 236-501, 45Degree (cable under 45degree), 3 pins, pitch 3.81mm, size 18.9x7.3mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.mouser.com/ds/2/324/ItemDetail_1935161-922578.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-9-5.0-H, 9 pins, pitch 10mm, size 85x8.1mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Philmore THT Terminal Block Phoenix PT-1,5-10-3.5-H, 10 pins, pitch 3.5mm, size 22x8.3mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00287_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00084, vertical.

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