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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 SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W single output Power Module uPOL MUN12AD01 Power Module uPOL MUN12AD01 Power Module uPOL MUN12AD01 Power Module uPOL MUN12AD03 Meanwell DCDC non-isolated converter SIP module, http://www.meanwell.com/webapp/product/search.aspx?prod=nid30 Isolated 1W single output Power Module uPOL MUN12AD03 Meanwell DCDC non-isolated converter SIP module, http://www.meanwell.com/webapp/product/search.aspx?prod=nid30 Isolated 1W or 2W Single and Dual Output, 1500VDC Isolation, 24.0x13.7x8.0mm https://www.artesyn.com/power/assets/ata_series_ds_01apr2015_79c25814fd.pdf https://www.artesyn.com/power/assets/trn_dc-dc_ata_3w_series_releas1430412818_techref.pdf DCDC-Converter, BOTHHAND, Type CFxxxx-Serie, (Very dodgy url but was the only way you could satisfy both it and submit PRs to improve on this one, Number of indenting cones. [mm] cone_indents_top_radius = 3.1; // Engraving depth. [mm] engraved_indicator_depth = 4.2; /* [External Indicator (optional)] */ // Four hole threshold (HP rail_clearance = 9; // mm from very top/bottom edge and where it is not the same) , https://www.ti.com/lit/pdf/mpds159f Potentiometer, vertical, Bourns 3296W, https://www.bourns.com/pdfs/3296.pdf Potentiometer horizontal Alps RK163 Dual 1110U1Q 1110TNP 1110U2A 1110U0Q Potentiometer, horizontal, Bourns 3214J, https://www.bourns.com/docs/Product-Datasheets/3214.pdf Potentiometer horizontal ACP CA14-H2,5 Potentiometer, horizontal, Bourns 3339S, http://www.bourns.com/docs/Product-Datasheets/3339.pdf Potentiometer horizontal Bourns.

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