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A straightforward build: one op-amp, four transistors 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, normal polarization (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf SD, SMD, top-mount, push-push (https://www.hirose.com/product/document?clcode=CL0609-0004-8-82&productname=DM1AA-SF-PEJ(82)&series=DM1&documenttype=2DDrawing⟨=en&documentid=0000915301 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, Horizontal (https://www.we-online.com/components/products/datasheet/66011102111302.pdf Jushuo AFC07, FFC/FPC connector, FH12-10S-0.5SH, 10 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator Soldered wire connection, for a single 0.15 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-xV 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 0.75 mm² wire, reinforced insulation, conductor diameter 0.65mm, outer diameter 4.4mm, size source Multi-Contact FLEXI-E 0.75 (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 Mini-Fit Jr. Power Connectors, old mpn/engineering number: 1-794073-x, 4 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing⟨=en&documentid=0000992393), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 64 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/64L_VQFN_8x8_with%206_5x6_5%20EP_JXX_C04-0437A.pdf), generated with kicad-footprint-generator Molex SPOX Connector System, 5267-13A, 13 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, 2 Pins (http://www.molex.com/pdm_docs/sd/559320530_sd.pdf), generated with kicad-footprint-generator JST GH series connector, DF3EA-06P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing&lang=en&documentid=0001163317), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 105314-xx08, 4 Pins per row (http://www.molex.com/pdm_docs/sd/460071105_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 1, Wuerth electronics 9774025951 (https://katalog.we-online.de/em/datasheet/9774025951.pdf), generated with kicad-footprint-generator Hirose BM24 series connector, S12B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 48 Pin (http://www.thatcorp.com/datashts/THAT_626x_Datasheet.pdf), generated with kicad-footprint-generator JST ZE series connector, LY20-6P-DT1, 3 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ038187.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-0820, 8 Pins per row (http://suddendocs.samtec.com/prints/lshm-1xx-xx.x-x-dv-a-x-x-tr-footprint.pdf), generated with kicad-footprint-generator Molex MicroClasp horizontal Molex SPOX Connector System, 43045-0821 (alternative finishes: 43045-122x), 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 Molex CLIK-Mate top entry Molex Nano-Fit Power Connectors, old mpn/engineering number: 1-770870-x, 3 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF63M-2P-3.96DSA, 2 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 Inductor SMD Wuerth WE-DD TypL TypXL TypXXL Shielded Coupled Inductor, Wuerth Elektronik, WE-PD2, SMD, Typ MS, https://katalog.we-online.com/pbs/datasheet/744774022.pdf Choke Power Inductor WE-PDF Wuerth Shielded Power Inductor, https://productfinder.pulseelectronics.com/api/open/product-attachments/datasheet/p0599nl Shielded Molded High Current Inductor, body 22x25.7mm, https://www.we-online.com/catalog/en/WE-HCFT#/articles/WE-HCFT_SIZE_2504 Shielded High Current Inductors (https://www.vishay.com/docs/34295/sc15ah01.pdf SMD Vishay Inductor Low Profile Inductor, Vishay, IHLP series, 6.3mmx6.3mm Inductor, Vishay, IHLP series, 6.3mmx6.3mm Inductor, Vishay, IHLP series, 10.2mmx10.2mm Inductor, Wuerth Elektronik, Wuerth_MAPI-2010, 2.0mmx1.6mm.

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