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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 sot054_po.pdf to-92 sc-43 sc-43a sot54 PA33 temperature sensor diode TO-92 horizontal, leads in-line, narrow, oval pads, drill 0.75mm (see https://www.diodes.com/assets/Package-Files/TO92L.pdf and http://www.ti.com/lit/an/snoa059/snoa059.pdf TO-92L Molded Narrow transistor TO-92L leads in-line (large body variant of TO-92), also known as TO-226, wide, drill 0.75mm, hand-soldering variant with enlarged pads (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot487-1_po.pdf HTSSOP, 38 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_38_05-08-1750.pdf), generated with kicad-footprint-generator JST XA series connector, (https://www.stocko-contact.com/downloads/steckverbindersystem-raster-2,5-mm.pdf#page=15), generated with kicad-footprint-generator Hirose DF12E SMD, DF12E3.0-50DP-0.5V, 50 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-111-02-xxx-DV, 11 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-125-02-xx-DV-TE, 25 Pins per row (http://www.molex.com/pdm_docs/sd/530480210_sd.pdf), generated with kicad-footprint-generator Molex Pico-Clasp series connector, B11B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 5/12-V-7.5-ZB Terminal Block, 1732580 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732580), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-124-02-xxx-DV, 24 Pins (http://www.molex.com/pdm_docs/sd/5024260810_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 1, Wuerth electronics 97730406332 (https://katalog.we-online.com/em/datasheet/97730406332.pdf), generated with kicad-footprint-generator connector wire 1.5sqmm double-strain-relief Soldered wire connection with feed through strain relief, for a single 1 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 2.3mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310591_RT063xxHBWC_OFF-022684T.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00301 pitch 10mm size 95x9mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00088, 12 pins, pitch 5mm, size 16.5x15mm^2, drill diamater 1.15mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT single screw terminal block Metz Connect Type055_RT01504HDWU, 4 pins, pitch 5mm, size 70x9.8mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00001_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block 4Ucon ItemNo. 20193 pitch 3.5mm size 10.5x7.6mm^2 drill 1.2mm pad 2mm PhoenixContact PTSM0,5 2 HV 2,5mm vertical SMD spring clamp terminal block RND 205-00302 pitch 10mm Varistor, diameter 21.5mm, width 5.6mm, pitch 10mm Varistor, diameter 9mm, width 3.5mm, pitch 5mm size.

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