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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 half dozen. Reverse Avalanche VCO See http://www.kerrywong.com/2014/03/19/bjt-in-reverse-avalanche-mode/ for the setscrew hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1830622 8A 160V Generic Phoenix Contact connector footprint for: MCV_1,5/10-GF-3.81; number of pins: 09; pin pitch: 3.81mm; Vertical || order number: 1923979 16A (HC Generic Phoenix Contact connector footprint for: MC_1,5/12-GF-3.81; number of pins: 09; pin pitch: 3.50mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924473 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/7-GF-5.08; number of pins: 07; pin pitch: 5.08mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924486 16A (HC Generic Phoenix Contact SPT 2.5/12-H-5.0 Terminal Block, 1719396 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719396), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 2 times 0.75 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 2.7mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex LSHM 0.50 mm Razor Beam High-Speed Hermaphroditic Terminal/Socket Strip, LSHM-140-xx.x-x-DV-N, 40 Pins (http://www.molex.com/pdm_docs/sd/5019204001_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 0.25 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 3.5mm, size 10.5x6.5mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00056_DB_EN.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00031, 10 pins, pitch 5.08mm, size 81.3x9.8mm^2, drill diamater 1.15mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block Metz Connect Type171_RT13702HBWC, 2 pins, http://www.kingbright.com/attachments/file/psearch/000/00/00/L-483GDT(Ver.15B).pdf LED Round FlatTop Rectangular size 3.3x2.4mm^2 diameter 1.8mm, hole diameter 1.3mm, wire diameter 1.0mm THT rectangular pad as test point, pitch 5.08mm.

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