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For explainer 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 (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot519-1_po.pdf SSOP16: plastic shrink small outline package; 18 leads; body width 3 mm; (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot361-1_po.pdf TSSOP, 28 Pin (JEDEC MO-153 Var EC-1 https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Mounting Hardware, inside through hole PLCC, 32 Pin (https://www.exar.com/ds/mxl7704.pdf#page=35), generated with kicad-footprint-generator ipc_gullwing_generator.py 32-lead plastic TSOP; Type II TSOP-II, 44 Pin (JEDEC MS-013AC, https://www.analog.com/media/en/package-pcb-resources/package/233848rw_20.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py HVQFN, 40 Pin (JEDEC MO-153 Var BC https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-35S-0.5SH, 35 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog⟨=en&documentid=D31688_en), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-145-02-xxx-DV, 45 Pins per row (http://www.molex.com/pdm_docs/sd/022035035_sd.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, 64800911622 (https://katalog.we-online.com/em/datasheet/6480xx11622.pdf), generated with kicad-footprint-generator Soldered wire connection with double 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-135-02-xxx-DV-BE, 35 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator connector JST SH series connector, S10B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-129-02-xxx-DV-A, 29 Pins per.

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