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BackFor 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-126-2, Horizontal, RM 1.27mm, Multiwatt-7, staggered type-2 TO-220-4, Vertical, RM 2.29mm, IPAK, see https://www.diodes.com/assets/Package-Files/TO251.pdf TO-251-2 Vertical RM 5.08mm TO-126-2, Vertical, RM 5.475mm, SOT-93, see https://www.vishay.com/docs/95214/fto218.pdf TO-218-3 Vertical RM 0.97mm Multiwatt-9 staggered type-1 TO-220F-4, Vertical, RM 1.27mm, staggered type-2, see http://www.st.com/resource/en/datasheet/tda7391lv.pdf TO-220-11 Vertical RM 1.7mm PentawattF- MultiwattF-5 staggered type-1 TO-220F-4, Vertical, RM 2.286mm SIPAK Horizontal RM 2.54mm staggered type-2 TO-220-11, Vertical, RM 1.27mm, Multiwatt-7, staggered type-1 TO-220F-5, Vertical, RM 3.81mm, see https://www.onsemi.com/pub/Collateral/NJL3281D-D.PDF TO-264-5 Vertical RM 1.7mm Pentawatt Multiwatt-5 staggered type-2 TO-220-4 Horizontal RM 2.286mm Plastic near cylindrical package Sod-70 see: https://www.nxp.com/docs/en/data-sheet/KTY81_SER.pdf [StepUp generated footprint] SOT-227 / SOT-227B / ISOTOP, M4 mounting screws (https://www.vishay.com/docs/95423/sot227g2.pdf, https://www.vishay.com/docs/95793/vs-fc420sa10.pdf TR TO-3 TO3 TO-204 TO-3P-3, Horizontal, RM 1.7mm, IIPAK, I2PAK, see http://www.onsemi.com/pub/Collateral/EN8586-D.PDF TO-262-3 Horizontal RM 3.81mm Potentiometer, vertical, Bourns 3299Y, https://www.bourns.com/pdfs/3299.pdf Potentiometer vertical Bourns 3314R-GM5 Potentiometer, horizontal, Alps RK09L Double, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk09l/rk09l.pdf Potentiometer horizontal Bourns 3269X Potentiometer, vertical, Bourns 3224W, https://www.bourns.com/docs/Product-Datasheets/3224.pdf Potentiometer vertical Bourns 3296W Potentiometer, horizontal, Trimmer, RM-063 http://www.runtron.com/down/PDF%20Datasheet/Carbon%20Film%20Potentiometer/RM065%20RM063.pdf Potentiometer, vertical, Alps RK09L Double 1240015 1240019 12D0A1W 12D0A1T Potentiometer, vertical, Vishay T73YP, http://www.vishay.com/docs/51016/t73.pdf Potentiometer vertical Bourns 3266Y Potentiometer, horizontal, Bourns 3296P, https://www.bourns.com/pdfs/3296.pdf Potentiometer horizontal Bourns 3006W Potentiometer, horizontal, Bourns 3266Z, https://www.bourns.com/docs/Product-Datasheets/3266.pdf Potentiometer vertical Bourns 3299Y Potentiometer, horizontal, Piher PC-16 Single Potentiometer, vertical, shaft hole, ACP CA14-VSMD, http://www.acptechnologies.com/wp-content/uploads/2017/10/03-ACP-CA14-CE14.pdf Potentiometer vertical Piher PT-6-V Potentiometer, horizontal, Bourns 3214J, https://www.bourns.com/docs/Product-Datasheets/3214.pdf Potentiometer horizontal Piher PT-6-H Potentiometer, vertical, shaft hole, Bourns 3314R-1, http://www.bourns.com/docs/Product-Datasheets/3314.pdf Potentiometer vertical Bourns 3266Y Potentiometer, horizontal, Alps RK163 Dual 1110U1Q 1110TNP 1110U2A 1110U0Q Potentiometer, horizontal, Alps RK09K Single, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk09k/rk09k.pdf Potentiometer horizontal Bourns 3009P Potentiometer, horizontal, Piher T-16H Double, http://www.piher-nacesa.com/pdf/22-T16v03.pdf Potentiometer horizontal Piher PT-10-H05 Potentiometer, vertical, Omeg PC16BU, http://www.omeg.co.uk/pc6bubrc.htm Potentiometer horizontal Alps RK097 Single, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk097/rk097.pdf Potentiometer horizontal Bourns PTV09A-2 Single Potentiometer, vertical, bottom-adjust, single slot, Bourns 3314R-1, http://www.bourns.com/docs/Product-Datasheets/3314.pdf Potentiometer vertical.