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Of D35, but other options exist. Single-step button (SW13) isn't producing a high enough voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder SMD Tactile Switch, http://www.helloxkb.com/public/images/pdf/TS-1187A-X-X-X.pdf Ultraminiature Surface Mount Common Mode Choke, https://www.coilcraft.com/pdfs/0805usb.pdf Coilcraft 1812CAN Series Common Mode Line Filter, https://www.we-online.de/katalog/en/WE-SL5/, https://www.we-online.de/katalog/datasheet/744272471.pdf SMT Common Mode Choke, https://www.coilcraft.com/pdfs/0805usb.pdf Coilcraft 1812CAN Series Common Mode Line Filter API Delevan, Surface Mount Bridge Rectifier Diode SMD 0201 (0603 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py WQFN, 24 Pin (JEDEC MO-153 Var HB https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Molex LY 20 series connector, B10B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 44 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/2512S.pdf#page=17), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 43045-1421 (alternative finishes: 43045-060x), 3 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing⟨=en&documentid=0000992393), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 44 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/2512S.pdf#page=17), generated with kicad-footprint-generator JST PUD series connector, 502585-0570 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 4.5, Wuerth electronics 9774040960 (https://katalog.we-online.de/em/datasheet/9774040960.pdf,), generated with kicad-footprint-generator ipc_noLead_generator.py UQFN, 10 Pin (http://www.ti.com/lit/ml/mpds579b/mpds579b.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-117-02-xx-DV-PE-LC, 17 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-4P-1.25DS%2820%29/), generated with kicad-footprint-generator Molex PicoBlade series connector, SM14B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height 1.5, Wuerth electronics 97730256332 (https://katalog.we-online.com/em/datasheet/97730256332.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-143-02-xxx-DV-LC.

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