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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, wide, drill 0.75mm (see NXP sot054_po.pdf TO-126-2, Horizontal, RM 5.45mm, see https://toshiba.semicon-storage.com/us/product/mosfet/to-247-4l.html TO-247-3 Vertical RM 2.54mm staggered type-2 TO-220-9, Horizontal, RM 1.7mm, Pentawatt, Multiwatt-5, staggered type-1, see http://www.st.com/resource/en/datasheet/tda7391lv.pdf TO-220-11 Vertical RM 1.7mm IIPAK I2PAK TO-264-2, Horizontal, RM 5.475mm, SOT-93, see https://www.vishay.com/docs/95214/fto218.pdf TO-218-2 Vertical RM 1.27mm Multiwatt-7 staggered type-2 TO-220F-9, Vertical, RM 1.7mm, staggered type-1, see http://www.ti.com/lit/ds/symlink/lm3886.pdf TO-220F-11 Vertical RM 5.08mm TO-220-2, Vertical.

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