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Traces larger; MK uses a CA3080 OTA, an expensive 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, 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, 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, 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, reverse on-board, 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, Reverse Type, Outer Tail, Without Ejector (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Surface Mount, ZIF, Bottom Contact Style, 24 Circuits (https://www.molex.com/pdm_docs/sd/2005280240_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 2 times 2.5 mm² wire, reinforced insulation, conductor diameter 1.4mm, outer diameter 3.6mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Diode SMD 0201 (0603 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, 32 Pin (http://www.thatcorp.com/datashts/THAT_5171_Datasheet.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 4, Wuerth electronics 97730406334 (https://katalog.we-online.com/em/datasheet/97730406334.pdf), generated with kicad-footprint-generator Molex CLIK-Mate top entry JST VH series connector, SM11B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 42820-22XX, With thermal vias in pads, 6 Pins per row, Mounting: (http://www.molex.com/pdm_docs/sd/039281043_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-126-02-xxx-DV, 26 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000994748), generated with kicad-footprint-generator Hirose DF63 through hole, DF13-06P-1.25DSA, 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 ipc_noLead_generator.py Texas SIL0008D MicroSiP, 8 Pin (https://www.onsemi.com/pub/Collateral/NUF4401MN-D.PDF#page=6), generated with kicad-footprint-generator JST SH series connector, S15B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Samtec HLE horizontal Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-108-02-xxx-DV-BE-A, 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 Capacitor SMD AVX-J (1608-08 Metric), IPC_7351 nominal, (Body size source: IPC-SM-782 page 72, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator Molex Pico-Lock horizontal Molex KK 396 Interconnect System, old/engineering part number: 5273-07A example for new part number: 09-65-2028, 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 ipc_noLead_generator.py.

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