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BackOn 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, 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, Surface Mount, ZIF, 33 Circuits (http://www.molex.com/pdm_docs/sd/5022441530_sd.pdf molex FFC/FPC connector Pitch 0.5mm LFCSP, 8 Pin (https://www.st.com/resource/en/datasheet/lm2903.pdf#page=16), generated with kicad-footprint-generator Hirose DF13 through hole, DF13-12P-1.25DSA, 12 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-112-02-xxx-DV-BE-LC, 12 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 Soldered wire connection with feed through strain relief, for 2 times 1.5 mm² wires, reinforced insulation, conductor diameter 1.7mm, 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 ipc_noLead_generator.py WQFN, 14 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0137.PDF (T1433-2C)), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-114-02-xxx-DV-A, 14 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 JST PH series connector, B02B-XASK-1-A (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-137-02-xxx-DV-BE-A, 37 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 ipc_gullwing_generator.py TSSOP, 48 Pin (JEDEC MO-153 Var AE https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator JST XA series connector, B15B-ZESK-D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Mounting Hardware, inside blind hole M1.6, height 5, Wuerth electronics 9774070951 (https://katalog.we-online.de/em/datasheet/9774070951.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF63M-3P-3.96DSA, 3 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-4P-1.25DS%2820%29/), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 16 Pin (Allegro A4954 https://www.allegromicro.com/-/media/Files/Datasheets/A4954-Datasheet.ashx), generated with kicad-footprint-generator ACDC-Converter, 3W, Meanwell, IRM-02, THT, https://www.meanwell.co.uk/media/productPDF/IRM-02-spec.pdf ACDC-Converter, 3W, Meanwell, IRM-03, THT, https://www.meanwell.com/Upload/PDF/IRM-03/IRM-03-SPEC.PDF ACDC-Converter 5W THT HiLink board mount OR: | | Tayda | A-805 | | R31 | 1 | B10k | \*\*Potentiometer, 9 mm or 16 mm vertical board mount OR: | | | | | Tayda | A-111 | | | C1, C11 | 3 | 4.7k | Resistor | | | Tayda | A-826 | | | | Tayda | A-1672 | | R9 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/>
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