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($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, 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, 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, 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, reverse on-board, right-angle, push-pull (https://media.digikey.com/PDF/Data%20Sheets/Hirose%20PDFs/DM3D-SF.pdf 1.10mm Pitch microSD Memory Card Connector, Reverse Type, Outer Tail, Without Ejector (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, right-angle, push-pull (https://media.digikey.com/PDF/Data%20Sheets/Hirose%20PDFs/DM3D-SF.pdf 1.10mm Pitch microSD Memory 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&lang=en&documentid=0000915301 Hirose FH41, FFC/FPC connector, FH12-30S-0.5SH, 30 Pins per row (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, SM12B-SHLS-TF (http://www.jst-mfg.com/product/pdf/eng/eSHL.pdf), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-40DS-0.5V, 40 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 4 times 1.5 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-xV 2.0 (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 ZE series connector, BM04B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-1106, 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 SlimStack Fine-Pitch SMT Board-to-Board Connectors, 54722-0204, 20 Pins (http://www.molex.com/pdm_docs/sd/555600207_sd.pdf), generated with kicad-footprint-generator JST PUD top entry JST XH series connector, B2P-VH-FB-B, shrouded (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-125-02-xxx-DV, 25 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 Mounting Hardware, inside through hole ST Morpho Connector 144 With STLink ST Morpho Connector 144 With STLink ST Morpho Connector 144 With STLink ST Morpho Connector 144 With STLink ST Morpho Connector 144 STLink AI accelerated MCU with optional wifi, https://dl.sipeed.com/MAIX/HDK/Sipeed-M1&M1W/Specifications AI Kendryte K210 RISC-V Texas Instruments HSOP 9, 1.27mm pitch, single row Through hole angled pin header THT 1x27 2.54mm single row (from Kicad 4.0.7), script generated Surface mounted pin header THT 1x32 1.27mm single row style2 pin1 right Through hole Samtec HPM power header series 3.81mm post length THT 1x14 2.00mm single row Through hole socket strip THT 1x20 1.00mm single row style1 pin1 left Surface mounted pin header SMD 1x04 2.00mm single row Through hole pin header SMD.

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