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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://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, 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 Soldered wire connection, for 5 times 0.75 mm² wires, basic insulation, conductor diameter 0.48mm, outer diameter 1mm, 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 JST SH series connector, BM05B-GHS-TBT (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator JST PHD series connector, SM08B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DFN, 8 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/mic5355_6.pdf#page=15), generated with kicad-footprint-generator Diode SMD 1210 (3225 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 32 Pin (https://www.analog.com/media/en/package-pcb-resources/package/3416438741201015623cp_32_4.pdf), generated with kicad-footprint-generator Molex 734 Male header (for PCBs); Straight solder pin 1 x 1 mm, 734-144 , 14 Pins (http://www.molex.com/pdm_docs/sd/559350210_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-133-02-xxx-DV-BE-LC, 33 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator ipc_noLead_generator.py WQFN, 16 Pin (https://www.st.com/resource/en/datasheet/tsv521.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for a single 0.75 mm² wire, basic insulation, conductor diameter 0.4mm, outer diameter 2.1mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-103-02-xxx-DV-LC, 3 Pins per row (http://www.molex.com/pdm_docs/sd/431602102_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, SM13B-ZESS-TB (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VLGA, 4 Pin (https://ww1.microchip.com/downloads/en/DeviceDoc/DSC60XX-Ultra-Small-Ultra-Low-Power-MEMS-Oscillator-DS20005625C.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, B10P-VH-B (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator JST SH series connector, DF52-11S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator Soldered wire connection, for 5 times 1.5 mm² wires, basic insulation, conductor diameter 1.4mm, outer diameter 1.7mm, outer diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block connector http://www.phoenixcontact.com/us/products/1778696/pdf 2.5mm vertical SMD spring clamp terminal block RND 205-00046 pitch 5mm Varistor, diameter 21.5mm, width 6.7mm, pitch 10mm size 75x10.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00051, 8 pins, pitch 5mm, size 45x9mm^2, drill diamater 1.2mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT single screw terminal block RND 205-00079, 3 pins, pitch 5mm, size 41.5x15mm^2, drill diamater 1.2mm, pad diameter 2.6mm, see http://www.mouser.com/ds/2/324/ItemDetail_1935161-922578.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00074, 9 pins, pitch 5.08mm, size 10.2x11.2mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see.

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