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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 leads in-line, narrow, oval pads, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S package, 2-pin, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot337-1_po.pdf SSOP16: plastic shrink small outline package; 8 leads; body width 3 mm; (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot556-1_po.pdf 24-Lead Plastic QFN (3mm x 3mm) (see Linear Technology DFN_14_05-08-1708.pdf DFN14, 4x4, 0.5P; CASE 506CM (see ON Semiconductor 122BS.PDF PQFP, 100 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/tqfp_edsv/sv_100_4.pdf), generated with kicad-footprint-generator JST ZE series connector, B14B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-104-02-xxx-DV-BE-A, 4 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator JST VH series connector, LY20-8P-DLT1, 4 Circuits (https://www.molex.com/pdm_docs/sd/2005280040_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, external M3, height 8.6, Wuerth electronics 9774140360 (https://katalog.we-online.de/em/datasheet/9774140360.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, old mpn/engineering number: 1-770973-x, 7 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-137-02-xx-DV-TE, 37 Pins per row (http://www.molex.com/pdm_docs/sd/1053131208_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TQFP, 52 Pin (http://www.holtek.com/documents/10179/116711/HT1632Cv170.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-5010, 50 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 43915-xx14, 7 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 48 Pin (JEDEC MO-153 Var HB https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 1.5/10-H-3.5 Terminal Block, 1732441 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732441), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-111-02-xxx-DV, 11 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 Connector Phoenix Contact connector footprint for: MCV_1,5/2-GF-5.08; number of pins: 08; pin pitch: 7.62mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1776579 12A || order.

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