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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 the circumference of the shaft hole, Piher PT-15-V15, http://www.piher-nacesa.com/pdf/14-PT15v03.pdf Potentiometer vertical Piher PC-16 Triple, http://www.piher-nacesa.com/pdf/20-PC16v03.pdf Potentiometer horizontal Bourns 3005 Potentiometer, horizontal, Vishay 148-149 Single, http://www.vishay.com/docs/57040/148149.pdf Potentiometer horizontal Vishay 148E-149E Dual, http://www.vishay.com/docs/57040/148149.pdf Potentiometer vertical Bourns 3224W Potentiometer, vertical, Bourns PRS11S, http://www.bourns.com/docs/Product-Datasheets/PRS11S.pdf Potentiometer vertical Bourns 3296Y Potentiometer, horizontal, Piher PT-15-H05, http://www.piher-nacesa.com/pdf/14-PT15v03.pdf Potentiometer horizontal Bourns 3314S Potentiometer, vertical, top-adjust, Bourns 3314J, http://www.bourns.com/docs/Product-Datasheets/3314.pdf Potentiometer, vertical, Alps RK09L Double, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk09l/rk09l.pdf Potentiometer horizontal Bourns 3214J Potentiometer, vertical, Trimmer, RM-065 https://components101.com/sites/default/files/component_datasheet/Preset%20Potentiometer%20%28Trimpot%29.pdf potentiometer vertical TT P0915N single Potentiometer, vertical, shaft hole, ACP CA6-VSMD, http://www.acptechnologies.com/wp-content/uploads/2017/06/01-ACP-CA6.pdf Potentiometer vertical Bourns 3266W Potentiometer, horizontal, Piher PT-6-H, http://www.piher-nacesa.com/pdf/11-PT6v03.pdf Potentiometer horizontal ACP CA9-H2,5 Potentiometer, horizontal, Vishay 148-149 Single, http://www.vishay.com/docs/57040/148149.pdf Potentiometer horizontal Vishay 148-149 Single, http://www.vishay.com/docs/57040/148149.pdf Potentiometer horizontal ACP CA6-H2,5 Potentiometer, horizontal, Bourns 3006P, https://www.bourns.com/docs/Product-Datasheets/3006.pdf Potentiometer horizontal ACP CA14-H5 Potentiometer, vertical, 9mm, dual, http://www.taiwanalpha.com.tw/downloads?target=products&id=113 potentiometer vertical TT P0915N single Potentiometer, vertical, Bourns 3339P.

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