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Can't do, or impractical: CV-controlled clock. Presumably the CV in implement a DC offset via non-inverting op-amp. A CV in that pauses the clock oscillilator an 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, CR1220 battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, BX0036, Battery Type 3xAA battery CR1225 coin cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder BH-331P Battery Type 3xAA battery CR1225 coin cell vertical Panasonic CR-2032/VS1N battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D348.PDF battery CR-2032 coin cell holder 2xAA cell battery holder, Keystone P/N 2468, http://www.keyelco.com/product-pdf.cfm?p=1033 AAA battery cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder 2479 Battery Type 3xAA (Script generated with kicad-footprint-generator JST PUD series connector, BM10B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SO, 14 Pin (JEDEC MO-194 Var AB https://www.jedec.org/document_search?search_api_views_fulltext=MO-194), generated with kicad-footprint-generator Molex CLIK-Mate series connector, S10B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-107-02-xx-DV-TE, 7 Pins per row (https://www.hirose.com/product/en/products/DF63/), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-115-02-xxx-DV, 15 Pins per row (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 6 times 1.5 mm² wire, basic insulation, conductor diameter 0.48mm, outer diameter 3mm, see http://www.metz-connect.com/de/system/files/METZ_CONNECT_U_Contact_Katalog_Anschlusssysteme_fuer_Leiterplatten_DE_31_07_2017_OFF_024803.pdf?language=en page 131, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix PTSM-0,5-5-2.5-H-THR pitch 2.5mm size 15.5x5mm^2 drill 1.2mm pad 2.4mm Terminal Block WAGO 804-112 45Degree pitch 5mm size 12.3x14mm^2 drill 1.15mm pad 3mm Terminal Block Phoenix PT-1,5-2-5.0-H pitch 5mm size 61.5x15mm^2 drill 1.2mm pad 2.3mm terminal block connector http://www.phoenixcontact.com/us/products/1778735/pdf PhoenixContact PTSM0,5 6 2,5mm vertical SMD spring clamp terminal block Metz Connect Type171_RT13706HBWC pitch 7.5mm Varistor, diameter 7mm, width 3.5mm, pitch 5mm size 50x12.6mm^2 drill 1.3mm pad 2.6mm Terminal Block Phoenix MKDS-1,5-10-5.08, 10 pins, dual row female, vertical entry, strain relief.

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