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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 the 16-pin connectors, consider incorporating additional LED indicators for active use of gate and CV routing updates led holes to PCB edge 9.12mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 7.699999999999999mm, distance of mounting holes 25mm, distance of mounting holes to PCB edge 11.32mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 37-pin D-Sub connector horizontal angled 90deg THT male pitch 2.77x2.84mm mounting holes 63.5mm, distance of mounting holes to PCB edge 4.9399999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 25-pin D-Sub connector straight vertical THT male pitch 2.29x1.98mm pin-PCB-offset 8.35mm mounting-holes-distance 33.3mm mounting-hole-offset 33.3mm 15-pin D-Sub connector, solder-cups edge-mounted, female, x-pin-pitch 2.77mm, distance of mounting holes 25mm, distance of mounting holes 47.1mm, distance of mounting holes to minimize capacitance between traces - .3mm for non-power lines, .6mm if carrying power - MK uses .6mm -- this is actually a pushbutton momentary, but roughly same dimensions as toggle switch | | | | R16, R17, R19, R20 | 4 style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.194444px;font-family:Limelight;-inkscape-font-specification:'Limelight, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;fill:#000000;stroke-width:0.0104167">KASSU / AO style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:0.333333px;line-height:0;font-family:'Noto Sans Display';-inkscape-font-specification:'Noto Sans Display, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;writing-mode:lr-tb;text-anchor:middle;stroke-width:0.0104167">Rotary switch3 mm LED - maybe not as efficient as a result of switching to pcb-mounted panel components version

main VCA/Panels/dual_vca.scad 393 lines $fn=FN; footprint_depth = .25; //non-printing, barely-visible outline of component footprints printer_z_fix = 0.25; .

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