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BackVCA Probably a straightforward build: one op-amp, four transistors and some example modules schematic start, and some supporting components. ~$6 in parts, depending on exact order number), See: http://katalog.we-online.de/em/datasheet/6941xx301002.pdf Compact Flash Card connector, polarization inverse (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf Compact Flash Card connector, normal polarization (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf SD, SMD, right-angle, push-pull (https://www.hirose.com/product/en/download_file/key_name/DM3AT-SF-PEJM5/category/Drawing%20(2D)/doc_file_id/44099/?file_category_id=6&item_id=06090031000&is_series= Micro SD, SMD, reverse on-board, right-angle, push-pull (https://media.digikey.com/PDF/Data%20Sheets/Hirose%20PDFs/DM3D-SF.pdf 1.10mm Pitch microSD Card Connector, Normal Type, Outer Tail, Without Ejector (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Hinge Type, https://www.molex.com/pdm_docs/sd/472192001_sd.pdf BNC coaxial connector vertical, Amphenol 031-71059, https://www.amphenolrf.com/library/download/link/link_id/594427/parent/031-5539/ Würth WR-SMA PCB SMT Jack, Vertical (https://www.we-online.com/components/products/datasheet/60312102114405.pdf Coaxial Connector 50 ohms Female Jack Vertical THT Amphenol RF 901-143 https://www.amphenolrf.com/library/download/link/link_id/585682 SMA THT Female Jack Vertical ExtendedLegs SMA THT Female Jack Vertical ExtendedLegs SMA THT Female Jack Horizontal SMA THT Female Jack Vertical ExtendedLegs SMA THT Female Jack Vertical THT Amphenol RF 901-143 https://www.amphenolrf.com/library/download/link/link_id/585682 SMA THT Female Jack Vertical Bulkhead Molex SMA RF Connectors, Edge Mount, (http://www.molex.com/pdm_docs/sd/732512120_sd.pdf Connector SMA, 0Hz to 20GHz, 50Ohm, Edge Mount Universal Serial Bus (USB) Shielded I/O Plug, Type C, right-angle, SMT, https://datasheet.lcsc.com/lcsc/2206091745_XKB-Connectivity-U254-051T-4BH83-F1S_C397452.pdf USB Micro-B horizontal SMD GCT Micro USB Typ-B (http://www.molex.com/pdm_docs/sd/1051330001_sd.pdf Micro-USB SMD Typ-B GCT Molex Vertical Micro USB B receptable with flange, https://cdn.amphenol-icc.com/media/wysiwyg/files/drawing/10118193.pdf USB Micro-B horizontal SMD GCT Micro USB AB receptable, right-angle inverted (https://www.molex.com/pdm_docs/sd/475900001_sd.pdf Micro AB USB SMD USB 2.0 Type B 10103594-0001LF, http://cdn.amphenol-icc.com/media/wysiwyg/files/drawing/10103594.pdf USB USB_B USB_micro USB_OTG USB Micro-B, horizontal, https://cdn.amphenol-icc.com/media/wysiwyg/files/drawing/10104110.pdf USB Micro B horizontal dustproof waterproof IP67 XKB Connectivity, USB Micro-B, horizontal, https://cdn.amphenol-icc.com/media/wysiwyg/files/drawing/10104110.pdf USB Micro B horizontal dustproof waterproof IP67 XKB Connectivity, USB Micro-B, right-angle, SMT, https://datasheet.lcsc.com/lcsc/2204071530_G-Switch-GT-USB-7010ASV_C2988369.pdf USB Type C, Right Angle, Surface Mount, Push-Pull Type, 1.42mm Height, with Detect Switch (https://www.molex.com/pdm_docs/sd/1040310811_sd.pdf Micro SD Wuerth Wurth Würth dual independently isolated BNC plug (https://www.winconn.com/wp-content/uploads/364A2595.pdf Dual BNC Amphenol Horizontal Panel-mountable BNC connector mounted through PCB, vertical BNC RF Interface, PCB mount (https://www.amphenolltw.com/2012download/2D%20PDF/03_M%20Series%20Sensor%20Connectors/M8S-XXPMMR-SF8001.pdf 3.5 mm, Stereo, Right Angle, Surface Mount, ZIF, 33 Circuits (https://www.molex.com/pdm_docs/sd/5022313300_sd.pdf Molex 0.50mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact FFC/FPC, 200528-0050, 5 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-124-02-xx-DV-TE, 24 Pins (http://www.molex.com/pdm_docs/sd/903250004_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-107-02-xxx-DV, 7 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-148-02-xx-DV-TE, 48 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 Sabre Power Connector, 46007-1106, With thermal vias and counter-pad, see http://www.ti.com/lit/ds/symlink/tps62177.pdf WSON-10 package 2x3mm body, pitch 0.5mm, see http://www.ti.com/lit/ds/symlink/tps62177.pdf WSON 0.5 thermal vias in pads.
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