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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, wide, drill 0.75mm, handsoldering variant with enlarged pads (see https://www.diodes.com/assets/Package-Files/TO92L.pdf and http://www.ti.com/lit/an/snoa059/snoa059.pdf TO-92L Inline Wide transistor TO-92L Molded Wide transistor TO-92Mini package, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S package, 2-pin, 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 sot054_po.pdf TO-92 leads molded, narrow, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot510-1_po.pdf TSSOP, 44 Pin (http://www.issi.com/WW/pdf/61-64C5128AL.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 56 Pin (JEDEC MO-153 Var AB-1 https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-134-02-xxx-DV-BE-LC, 34 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole straight pin header, 2x24, 1.27mm pitch, double rows Through hole straight socket strip, 1x01, 2.00mm pitch, single row Surface mounted pin header THT 2x19 1.00mm double row Through hole vertical IDC header THT 2x11 1.27mm double row Through hole pin header THT 1x08 2.54mm single row Surface mounted pin header SMD 1x19 2.00mm single row style1 pin1 left Surface mounted socket strip THT 2x28 1.27mm double row Through hole pin header THT 1x19 1.00mm single row (from Kicad 4.0.7), script generated Through hole straight socket strip, 2x06, 1.27mm pitch, 4.0mm pin length, single row Through hole IDC header, 2x05, 1.27mm pitch, single row Through hole pin header THT 1x12 2.00mm single row style1 pin1 left Surface mounted pin header SMD 1x37 2.00mm single row style2 pin1 right Through hole socket strip SMD 2x35 2.00mm double row Through hole straight socket strip, 2x02, 1.27mm.

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