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Of wires backwards Fix floating pin for op amp Fix floating pin for Pause (J19/J18); the schematic is incorrect - the current Fireball design, some pots are about 21mm apart, meaning that knobs shouldn't be so hard. In general, try to avoid multiple triggers on each Could replace step IDs with a 7-segment display 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 BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder BH-331P Battery Type C Plug Shenzhen Jing Tuo Jin Electronics Co 918-118A2021Y40002 ( https://datasheet.lcsc.com/lcsc/1912111437_Jing-Extension-of-the-Electronic-Co--918-118A2021Y40002_C399939.pdf ) also compatible with SOIC-8, 3.9x4.9mm² body, exposed pad, Analog Devices (http://www.analog.com/media/en/technical-documentation/data-sheets/ADL5542.pdf LFCSP 8pin Pitch 0.5mm, http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_8_6.pdf LFCSP 8pin thermal pad TQFP64 7x7, 0.4P CASE 932BH (see ON Semiconductor 932BH.PDF TQFP, 64 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/PIC16LF19195-6-7-Data-Sheet-40001873D.pdf#page=718), generated with kicad-footprint-generator connector wire 2.5sqmm double-strain-relief Soldered wire connection, for 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-103-02-xxx-DV-BE-LC, 3 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 Soldered wire connection with double feed through strain relief, for 6 times 0.15 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00232_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00049, 6 pins, pitch 3.5mm, size 56x7.6mm^2, drill diamater 1.3mm, pad diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00232_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-502, 45Degree (cable under 45degree), 4 pins, pitch 3.5mm, size 52.5x7.6mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_311011_RT016xxHBWC_OFF-022771S.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block connector PhoenixContact PTSM0,5 5 HV 2,5mm vertical SMD spring clamp terminal block Metz Connect Type067_RT01903HDWC, 3 pins, pitch 10mm, size 62.3x14mm^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_WAGO THT Terminal Block WAGO 804-108, 45Degree (cable under 45degree), 9 pins, pitch 2.54mm, size 13.2x6.2mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00067_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type067_RT01905HDWC pitch 10mm size 15x8.1mm^2 drill 1.3mm pad 2.5mm terminal block connector http://www.phoenixcontact.com/us/products/1778719/pdf PhoenixContact PTSM0,5 8 2,5mm vertical SMD spring clamp terminal block Metz Connect Type059_RT06304HBWC pitch 3.5mm size 25.2x7mm^2 drill 1.2mm pad 2.3mm terminal block RND 205-00072, 7 pins, pitch 5mm, size 10x12.6mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00067 pitch 7.5mm size 22.5x10.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00234, 4 pins, pitch 5mm, size 15x8.1mm^2, drill diamater 1.3mm, pad diameter 3mm, see .

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