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One tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on this script here. Arrow_indicator = true; arrow_indicator_scale = 1.3; arrow_indicator_translate = [0,1,16]; arrow_scale_head = 2; holeWidth = 5.08; // 5.08, must explicitly account for squishing // middle-bottom h rib // h_wall(h=4, l=right_rib_x); // middle horizontal rib //} module make_surface(filename, h) { cylinder(r=hole_r, h=thickness*2); echo("Putting a hole with radius: ", hole_r , " at ", width_mm - 9.5/2 - right_rib_thickness - tolerance; // rib + half a jack col_right = width_mm - col_right + tolerance*4; // column from edge plus hole radius // elevated sockets to fit in glide controls More mounting hole 2.2mm m2 din965 Mounting Hole 5.3mm, no annular, M2, ISO14580 mounting hole 4.3mm no annular Mounting Hole 2.2mm, no annular, M3, ISO14580 mounting hole 6.5mm no annular Mounting Hole 4.3mm, M4 mounting hole 3.7mm no annular mounting hole 2.2mm m2 din965 Mounting Hole 8.4mm, M8 mounting hole 4.3mm no annular m6 iso14580 Mounting Hole 3.2mm, M3 mounting hole 3.2mm m3 Mounting Hole 4mm, no annular m2 iso7380 Mounting Hole 4.3mm.

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