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Https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP sot054_po.pdf TO-92 leads in-line, narrow, oval pads, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S package, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot266-1_po.pdf SSOP, 20 Pin (http://www.ti.com/lit/ds/symlink/drv8662.pdf#page=23), generated with kicad-footprint-generator Soldered wire connection, for 4 times 2.5 mm² wires, basic insulation, conductor diameter 0.4mm, 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 QFN, 48 Pin (http://ww1.microchip.com/downloads/en/devicedoc/00002117f.pdf#page=69), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 09-65-2068, 6 Pins (http://www.molex.com/pdm_docs/sd/559320530_sd.pdf), generated with kicad-footprint-generator Wuerth WR-WTB series connector, S3B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-140-02-xxx-DV-LC, 40 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-40S-0.5SH, 40 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog⟨=en&documentid=D31688_en), generated with kicad-footprint-generator Soldered wire connection, for 6 times 0.5 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00232_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block TE 1-282834-1 pitch 2.54mm size 5.54x6.5mm^2 drill 1.1mm pad 2.1mm Terminal Block Phoenix MPT-0,5-3-2.54 pitch 2.54mm DCDC-Converter, RECOM, RECOM_R-78HB-0.5, SIP-3, pitch 2.54mm, package size 32.2x9.1x15mm^3, https://www.recom-power.com/pdf/Innoline/R-5xxxPA_DA.pdf dc-dc recom buck sip-12 pitch 2.54mm size 18.2x6.2mm^2 drill 1.1mm pad 2.1mm terminal block RND 205-00047 pitch 5mm size 55x8.1mm^2 drill 1.3mm pad 2.6mm Terminal Block Phoenix MKDS-3-10-5.08, 10 pins, pitch 10mm, size 115x9mm^2, drill diamater 1.15mm, pad diameter 1.4mm, outer diameter 3.9mm, 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 JST ZE series connector, S13B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-133-02-xxx-DV-A, 33 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SSOP18: plastic shrink small outline package; 14 leads; body width 3.9 mm; lead pitch 0.635; (see http://cds.linear.com/docs/en/datasheet/38901fb.pdf 28-Lead Plastic Shrink Small Outline (SSO/Stretched SO), see https://www.vishay.com/docs/83831/lh1533ab.pdf SSO Stretched SO SOIC 2.54 8-Lead Plastic Dual Flat, No Lead Package .

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