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DAC https://www.youtube.com/watch?v=t3kUPjdiq0o 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 (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, see https://www.diodes.com/assets/Package-Files/TO126.pdf TO-126-3 Vertical RM 1.27mm Multiwatt-7 staggered type-2 TO-220F-7 Vertical RM 2.54mm staggered type-1 TO-220-5, Horizontal, RM 2.54mm, see https://www.diodes.com/assets/Package-Files/TO126.pdf TO-126-3 Vertical RM 1.7mm PentawattF- MultiwattF-5 TO-220F-7, Vertical, RM 1.27mm, MultiwattF-15, staggered type-1 TO-220F-4, Vertical, RM 3.81mm, see https://www.onsemi.com/pub/Collateral/NJL3281D-D.PDF TO-264-5 Horizontal RM 1.7mm PentawattF- MultiwattF-5 staggered type-1 TO-220F-2, Horizontal, RM 1.7mm, IIPAK, I2PAK, see http://www.onsemi.com/pub/Collateral/EN8586-D.PDF TO-262-3 Horizontal RM 2.54mm TO-220-3, Vertical, RM 1.7mm, PentawattF-, MultiwattF-5, staggered type-2 TO-220-11, Horizontal, RM 2.54mm, see https://www.njr.com/semicon/PDF/package/TO-220F-4_E.pdf TO-220F-4 Horizontal RM 2.54mm TO-218-2, Horizontal, RM 10.9mm, see https://diotec.com/tl_files/diotec/files/pdf/datasheets/pb1000.pdf Single phase bridge rectifier case 15.7x15.7 Single phase bridge rectifier case 15.7x15.7 Single phase bridge rectifier case 15.2x15.2mm, pitch 10.9mm, see https://diotec.com/tl_files/diotec/files/pdf/datasheets/pb1000.pdf Single phase bridge rectifier case 15.1x15.1mm, pitch 10.9mm, see https://diotec.com/tl_files/diotec/files/pdf/datasheets/pb1000.pdf Single phase bridge rectifier case KBPC6, see http://www.vishay.com/docs/93585/vs-kbpc1series.pdf Single phase bridge rectifier case 28.6x28.6mm, pitch 18.0mm & 11.6mm, see https://diotec.com/tl_files/diotec/files/pdf/datasheets/kbpc1500fw.pdf Diotec 32x5.6x17mm rectifier package, 5.08mm pitch, single row Through hole straight socket strip, 2x11, 2.54mm pitch, DIN 41651 / IEC 60603-13, double rows, 12.0mm latches, mounting holes, https://docs.google.com/spreadsheets/d/16SsEcesNF15N3Lb4niX7dcUr-NY5_MFPQhobNuNppn4/edit#gid=0 Through hole pin header SMD 1x20 2.54mm single row Through hole vertical IDC.

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