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A CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, needing only one tl074 and support components, so tiny PCB should be 1. // @todo Refactor the top_rounding() operation faster. Everything else is already fast enough to attach knob Schematics/SynthMages.pretty/Alpha Rotary 12.kicad_mod // Width of module (HP) width = 38; // [1:1:84] v_margin = hole_dist_top*2 + thickness; col_left = thickness * 1.2; right_rib_x = width_mm - thickness*2; left_rib_x = thickness * 1; h_wall(h=4, l=right_rib_x); // one more to mount the circuit board to, dead center // pcb_holder(h=10, l=top_row-rail_clearance*2-15-thickness, th=1.15, wall_thickness=1); // lower h-rib reinforcer ## Photos ### Photos ## Documentation: * [Schematic](Docs/precadsr.pdf) * PCB layout: [front](Docs/precadsr_layout_front.pdf), [back](Docs/precadsr_layout_back.pdf) * [BOM](Docs/precadsr_bom.md) * [Build notes](Docs/build.md) How to use for rounding teh top edge. [mm] top_rounding_radius = 8; // Cylinder faces to use for the shaft. If the knob on a stem to form a mushroom shape. Enable_stem = false; $title_text = trim($img->getAttribute('title')); if (!$alt_text) { $new_element = $doc->createElement("div"); $para_element = $doc->createElement("p"); $article['content'] = preg_replace('#(/[0-9-]+)-150x150\.gif#', '$1.gif', $article['content']); $article['content'] = $doc->saveXML(); // Questionable Content (cleanup) $article['content'] .= "
Alt: " . $img->getAttribute('title') . ""; } } // Dinosaur Comics (alt tags+blog), CAD, attempt at OOTS (but that one fails due to referer checks Added BCN, Something Positive $alt_text = $entry->getAttribute('alt'); $alt_text = $entry->getAttribute('alt'); $alt_text = trim($img->getAttribute('alt')); if (!$alt_text || $alt_text .

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