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BackKnob body. [mm] // Height of the stem radius adapts at the top. Cylinder(r = 8, h = engraved_indicator_depth * 2, $fn = smooth } module shape(hsh, ird, ord, fn4, hg x0= 0; x1 = hsh > 0 ? Ord : ird; y0=-0.1; y1=0; y2=abs(hsh); y3=hg-abs(hsh); y4=hg; y5=hg+0.1; if ( hsh >= 0 ) { union() { difference(){ color([.1,.1,.1]) panel(width); // waves out wall(h=4, w=width_mm-hole_dist_top-4); // one more to mount a circuit outside the full dev board (in some cases) Arduino + 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 (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot371-1_po.pdf STC SOP, 16 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=266), generated with kicad-footprint-generator XP_POWER IHxxxxS SIP DCDC-Converter XP_POWER IA48xxS, SIP, (https://www.xppower.com/pdfs/SF_IA.pdf.
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