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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 variant by Heraeus, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot361-1_po.pdf TSSOP, 28 Pin (JEDEC MO-153 Var JD https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator ipc_noLead_generator.py TQFP, 48 Pin (https://www.lumissil.com/assets/pdf/core/IS31FL3236_DS.pdf), generated with kicad-footprint-generator JST PH series connector, B04B-JWPF-SK-R (http://www.jst-mfg.com/product/pdf/eng/eJWPF1.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 1, Wuerth electronics 9771120360 (https://katalog.we-online.com/em/datasheet/9771120360.pdf), generated with kicad-footprint-generator Hirose DF63 vertical Hirose DF13C SMD, CL535-0415-4-51, 15 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⟨=en&documentid=0000994748), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 36 Pin (http://www.issi.com/WW/pdf/61-64C5128AL.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-124-02-xxx-DV-BE-LC, 24 Pins (http://www.molex.com/pdm_docs/sd/908140004_sd.pdf), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 53048-0610, 6 Pins per row (https://cdn.harwin.com/pdfs/M20-890.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 row (http://www.molex.com/pdm_docs/sd/022035035_sd.pdf), generated with kicad-footprint-generator Diode SMD 0805 (2012 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Molex Molex 1.00mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact FFC/FPC, 200528-0240, 24 Circuits (http://www.molex.com/pdm_docs/sd/5022441530_sd.pdf Molex 0.50mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact FFC/FPC, 200528-0190, 19 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 5/3-V-7.5-ZB Terminal Block, 1732412 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732412), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 20 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_20_05-08-1742.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py 6-Lead Plastic Dual Flat, No Lead Package (MF) - 3x3x0.9 mm Body [DFN] (see Microchip Packaging Specification 00000049BS.pdf 8-Lead Plastic DFN (2mm x 3mm) (see Linear Technology DFN_12_05-08-1725.pdf DE/UE Package; 12-Lead Plastic Micro Small Outline Package (MS) [MSOP], variant of 8-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 28-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), LongPads 42-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), see https://ac-dc.power.com/sites/default/files/product-docs/tinyswitch-iii_family_datasheet.pdf Power Integrations eDIP-12B, see https://www.power.com/sites/default/files/product-docs/linkswitch-pl_family_datasheet.pdf 4-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 22-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), SMDSocket, LongPads THT DIP DIL PDIP 2.54mm 7.62mm 300mil LongPads 4-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket 24-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size 9.78x22.5mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile, JPin SMD DIP Switch SPST Slide 7.62mm 300mil 8-lead dip package, row spacing 10.16 mm (400 mils 22-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size 9.78x22.5mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 8x-dip-switch.

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