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Combination to be more stable than MK's, but it's unclear whether JLCPCB is still the best option. This page is to tumblr, but there's a url in the digital realm, or perhaps an external clock. One idea: add a voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a 7-segment display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100CY, light-direction upwards, see http://www.everlight.com/file/ProductFile/ITR8307.pdf refective opto couple photo coupler IR Receiver Vishay TSOP-xxxx MINICAST IR Receiver Vishay TSOP-xxxx, MINICAST package, see https://www.vishay.com/docs/82493/tsop311.pdf package for Osram SFH9x0x series of reflective photo interrupter SMD PhotoDiode, plastic SMD DIL, 4.5x4mm² PhotoDiode plastic SMD DIL, 4.5x4mm, area: 2.2x2.2mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5989350/BP%20104%20FAS_EN.pdf PhotoDiode, plastic SMD DIL, 4.5x4mm² PhotoDiode plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467146/SFH%202440_EN.pdf DFN, 6 Pin (http://www.ti.com/lit/ds/symlink/tps61040.pdf#page=35), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-139-02-xx-DV-PE-LC, 39 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000994748), generated with kicad-footprint-generator connector wire 1.5sqmm strain-relief Soldered wire connection with feed through strain relief, for 5 times 0.25 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 1mm, size source Multi-Contact FLEXI-E/HK 0.127 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST PH series connector, S3B-XH-A-1 (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Soldered wire connection, for 4 times 1.5 mm² wires, basic insulation, conductor diameter 2mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-xV 2.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 64 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606_7606-6_7606-4.pdf), generated with kicad-footprint-generator Hirose DF12E SMD, DF12E3.0-36DP-0.5V, 36 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator JST XA series connector, B15B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 5/10-V-7.5-ZB Terminal Block, 1732425 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732425), generated with kicad-footprint-generator Molex Picoflex Ribbon-Cable Connectors, 90325-0016.

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