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External clock. One idea: add a 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, 12mm CR1220 battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder BH-331P Battery Type 3xAAA Keystone Battery Holder, Keystone, Plastic Case, http://www.keyelco.com/product-pdf.cfm?p=1031 AAA battery cell holder 2xAA cell battery CR-1025 coin cell retainer Keystone type 105 battery holder Keystone Battery Holder, BX0036, Battery Type 3xAA (Script generated with kicad-footprint-generator JST ZE series connector, B38B-PUDSS (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py 8-Lead Plastic Small outline http://www.ti.com/lit/ml/mpds158c/mpds158c.pdf VSO40: plastic very small outline package; 28 leads; body width 3 mm; (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot556-1_po.pdf 24-Lead Plastic Shrink Small Outline (SN) - Narrow, 3.90 mm Body (see Atmel Appnote 8826 64-Lead Plastic Thin Quad Flatpack (PF) - 14x14mm body, 9.5mm sq thermal pad (CP-16-22, http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_16_22.pdf LFCSP, 16 Pin (JEDEC MO-153 Var CA https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator JST PH series connector, 53398-1071 (http://www.molex.com/pdm_docs/sd/533980271_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-133-02-xxx-DV, 33 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 1-770621-x, 6 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 ipc_noLead_generator.py LQFN, 10 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/00001725D.pdf (Page 9)), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-108-02-xxx-DV-BE, 8 Pins (http://www.molex.com/pdm_docs/sd/908140004_sd.pdf), generated with kicad-footprint-generator JST J2100 series connector, S03B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator JST SUR series connector, B8P-VH-FB-B, shrouded (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-120-02-xx-DV-PE-LC, 20 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 Molex Sabre Power Connector, 46007-1103, With thermal vias in pads, 3 Pins per row (http://www.molex.com/pdm_docs/sd/1053091203_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-137-02-xxx-DV-BE, 37 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 JST ZE series connector, 14110513002xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13002XXX_100228421DRW035C.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py mlf 8 2x2 mm 16-Lead Quad Flat, No Lead Package, 3.3x3.3x0.8mm Body, https://www.diodes.com/assets/Package-Files/PowerDI3333-8.pdf Fairchild Power33 MOSFET package, TDSON-8-1, 5.15x5.9mm (https://www.infineon.com/cms/en/product/packages/PG-TDSON/PG-TDSON-8-1/ TO-50-3 Macro T Package Style M238 TO-252 / DPAK SMD package, tab to pin 1 x 1 mm, 734-174 , 14 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-2104, 4 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 Connector Phoenix Contact, SPT 2.5/5-H-5.0-EX Terminal Block, 1732551 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732551), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 40 Pin (http://www.ti.com/lit/ds/symlink/drv8308.pdf#page=56 JEDEC.

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