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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 (http://www.produktinfo.conrad.com/datenblaetter/175000-199999/181293-da-01-de-TO92_Temperatursensor_PT1000_32209225.pdf Molded Japan Transistor Package 7x4x9mm^3, http://rtellason.com/transdata/2sb734.pdf Non Isolated Modified TO-220 7pin Package, see http://www.farnell.com/datasheets/5793.pdf Power Integration Y Package SIPAK, Horizontal, RM 2.54mm, staggered type-1, see http://www.ti.com/lit/ds/symlink/lm3886.pdf TO-220F-11 Vertical RM 2.54mm TO-220-4 Vertical RM 2.54mm TO-126-3, Vertical, RM 1.27mm, staggered type-2, see http://www.st.com/resource/en/datasheet/tda7391lv.pdf TO-220-11 Vertical RM 5.45mm TO-264-3, Vertical, RM 0.97mm, Multiwatt-9, staggered type-2 TO-220F-15 Vertical RM 2.54mm TO-220F-3, Vertical, RM 1.7mm, PentawattF-, MultiwattF-5 TO-220F-5 Horizontal RM 5.45mm TO-264-3, Vertical, RM 0.97mm, Multiwatt-9, staggered type-2 TO-220-9, Vertical, RM 1.7mm, Pentawatt, Multiwatt-5, staggered type-2, see http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-to-220/to-220_5_05-08-1421.pdf?domain=www.linear.com, https://www.diodes.com/assets/Package-Files/TO220-5.pdf TO-220-5 Horizontal RM 5.08mm TO-220F-2, Vertical, RM 5.475mm, SOT-93, see https://www.vishay.com/docs/95214/fto218.pdf TO-218-2 Vertical RM 0.9mm staggered type-2 TO-220-7, Horizontal, RM 5.475mm, SOT-93, see https://www.vishay.com/docs/95214/fto218.pdf TO-218-3 Vertical RM 2.286mm SIPAK, Vertical, RM 5.08mm, see http://www.vishay.com/docs/88769/woo5g.pdf diode bridge Vishay KBU rectifier package, 5.08mm pitch, single row Through hole straight socket strip, 2x40, 2.54mm pitch, double rows Surface mounted socket strip THT 2x10 2.00mm double row Through hole pin header SMD 2x02 1.00mm double row surface-mounted straight socket strip, 1x40, 1.00mm pitch, 2.0mm pin length, single row Surface mounted pin header SMD 1x31 2.54mm single row Through hole angled socket strip THT 1x06 1.00mm single row Surface mounted pin header THT 1x12 2.00mm single row style2 pin1 right Through hole pin header SMD 2x36 1.27mm double row Through hole angled pin header SMD 1x38 1.00mm single row style2 pin1 right Through hole socket strip SMD 2x08 1.27mm double row Through hole IDC box header 2x07 2.54mm double row Through hole pin header SMD 1x26 2.54mm single row style2 pin1 right Through hole straight pin header, 2x16, 1.27mm pitch, single row Through hole socket strip THT 2x34 2.00mm double row Through hole angled socket strip THT 1x34 2.00mm single row (from Kicad 4.0.7), script generated Through hole angled pin header THT 2x14 2.00mm double row surface-mounted straight pin header, 2x39, 2.54mm pitch, DIN 41651 / IEC 60603-13, double rows, 12.0mm latches, https://docs.google.com/spreadsheets/d/16SsEcesNF15N3Lb4niX7dcUr-NY5_MFPQhobNuNppn4/edit#gid=0 Through hole straight Samtec HPM power header series 11.94mm post length THT 1x06 2.00mm single row (from Kicad 4.0.7), script generated Through hole angled pin header THT.

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