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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 the other leg of R21 to the base panel's thickness to account for squishing // middle-bottom h rib pcb_holder(h=10, l=top_row-rail_clearance*2-15-thickness, th=1.15, wall_thickness=1); // lower h-rib reinforcer Latest commits for file Schematics/schematic_bugs_v1.md Update Schematics/schematic_bugs_v1.md dcaec240831d28b722a7d7988287c76a1461e439 glide fix Notes from debugging Clock POT is too small for a press-on type knob (rather than using a setscrew). (ShaftLength must be non-zero. NotchedShaft = 0; right_rib_x = width_mm - 9.5/2 - right_rib_thickness - tolerance; // rib + half a jack col_right = width_mm - h_margin; input_column = h_margin; working_height = height - v_margin*2 - title_font_size; working_increment = working_height / (8+tolerance/5); // generally-useful spacing amount for vertical columns of stuff col_left = thickness + 6 + tolerance; // rib + half a jack col_right = width_mm - thickness*2; // How much horizontal space.

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