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And rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably 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, right-angle, push-pull (https://www.hirose.com/product/en/download_file/key_name/DM3BT-DSF-PEJS/category/Drawing%20(2D)/doc_file_id/44097/?file_category_id=6&item_id=06090029900&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, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Reverse Type, Outer Tail, Without Ejector (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Reverse Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD card connector, top mount, SMT (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F2041021%7FB%7Fpdf%7FEnglish%7FENG_CD_2041021_B_C_2041021_B.pdf%7F2041021-4 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, Reverse Type, Outer Tail, Without Ejector (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Reverse Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD card connector, top mount, SMT (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F2041021%7FB%7Fpdf%7FEnglish%7FENG_CD_2041021_B_C_2041021_B.pdf%7F2041021-4 Micro 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, Reverse Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Normal Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD card connector, top mount, SMT (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F2041021%7FB%7Fpdf%7FEnglish%7FENG_CD_2041021_B_C_2041021_B.pdf%7F2041021-4 Micro SD, SMD, right-angle, push-pull (https://www.hirose.com/product/en/download_file/key_name/DM3BT-DSF-PEJS/category/Drawing%20(2D)/doc_file_id/44097/?file_category_id=6&item_id=06090029900&is_series= Micro 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&lang=en&documentid=0000915301 Hirose FH41, FFC/FPC connector, FF0851SA1, 51 Circuits (http://www.molex.com/pdm_docs/sd/5022505191_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-136-02-xxx-DV-LC, 36 Pins per row (http://www.molex.com/pdm_docs/sd/1053101208_sd.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 52991-0308, 30 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 PicoBlade Connector System, 53047-0910, 9 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 734 Male header (for PCBs); Straight solder pin 1 x 1 mm, 734-178 , 18 Pins (https://www.molex.com/pdm_docs/sd/026605050_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, SM22B-SHLS-TF (http://www.jst-mfg.com/product/pdf/eng/eSHL.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 24 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_20_05-08-1742.pdf), generated with kicad-footprint-generator ipc_plcc_jLead_generator.py PLCC, 84 pins, through hole M2, height 6, Wuerth electronics 9771060360 (https://katalog.we-online.com/em/datasheet/9771060360.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.3mm, height 2, Wuerth electronics 9775026360 (https://katalog.we-online.com/em/datasheet/9775026360.pdf), generated with kicad-footprint-generator JST NV series connector, B4PS-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Resistor SMD 1218 (3246 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 28 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=280), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 9, Wuerth electronics 9774140960 (https://katalog.we-online.de/em/datasheet/9774140960.pdf,), generated with kicad-footprint-generator ipc_noLead_generator.py DFN, 8.

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