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Similar to SR2 "lite" and was really popular a couple years ago https://youtu.be/v9A9n-kMjz0?t=291 Ile Aye de Miranda has two versions: https://www.youtube.com/watch?v=IPLT2B8EH0A and https://www.youtube.com/watch?v=J04yoOoGRNk the second video. Https://youtu.be/frLXzG9-W3Q?t=1197 (variants, especially in the photo that the Source form of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; v_margin = hole_dist_top*2; left_rib_x = hole_dist_side + thickness; width_mm = 70.8; // 14HP×5.08mm = 71.12; ES for 14HP is 70.8 first_row = 25.65; //mm second_row = 47.25; //mm third_row = 65.75; //mm fourth_row = 88.25; //mm fifth_row = 108.75; //mm // Center two holes hole_r = 1.7; // Hole radius (mm // Hole distance from the bottom of box [right_edge, -extra_depth], // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom right [right_edge, rotate_vector_sin * rail_depth] // top horizontal rib h_wall(h=4, l=right_rib_x); // one more vertical 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 variant by Heraeus, drill 0.75mm (see NXP sot054_po.pdf to-92 sc-43 sc-43a sot54 PA33 diode SOD70 2-pin TO-92 horizontal, leads molded, wide, drill 0.75mm (http://www.produktinfo.conrad.com/datenblaetter/175000-199999/181293-da-01-de-TO92_Temperatursensor_PT1000_32209225.pdf Molded Japan Transistor Package 7x4x9mm^3, http://rtellason.com/transdata/2sb734.pdf Non Isolated Modified TO-220 7pin Package, see http://www.farnell.com/datasheets/5793.pdf Power Integration Y Package SIPAK, Horizontal, RM 2.54mm TO-220-5, Horizontal, RM 1.7mm, Pentawatt, Multiwatt-5, staggered type-1, see http://www.ti.com/lit/ds/symlink/lmd18200.pdf TO-220-15, Vertical, RM 5.45mm, see https://toshiba.semicon-storage.com/us/product/mosfet/to-247-4l.html TO-247-3 Vertical RM 0.97mm Multiwatt-9 staggered type-2 TO-220F-7 Vertical RM 2.54mm TO-220-4 Horizontal RM 5.08mm TO-126-3, Horizontal, RM 2.54mm, see http://ww1.microchip.com/downloads/en/DeviceDoc/20005685A.pdf TO-247-5 Horizontal RM 2.54mm staggered type-1 TO-220F-9, Vertical, RM 1.7mm, PentawattF-, MultiwattF-5, staggered type-1 TO-220-9 Horizontal RM 2.54mm TO-218-2, Horizontal, RM 1.7mm, Pentawatt, Multiwatt-5, staggered type-1, see http://www.st.com/resource/en/datasheet/tda7391lv.pdf TO-220-11 Horizontal RM 5.475mm SOT-93 TO-218-3, Vertical, RM 2.54mm, staggered type-1 TO-220-9, Horizontal, RM 2.54mm, see https://www.njr.com/semicon/PDF/package/TO-220F-4_E.pdf TO-220F-4 Vertical RM 3.81mm Potentiometer, vertical, Alps RK09K RK09D Single Snapin 113004U 1130A6S 11300DR 1130A8G 1130081 1130A5R 1130AP5 1130AST D1130C3W D1130C1B D1130C3C D1130C2P Potentiometer, vertical, Bourns 3314J, http://www.bourns.com/docs/Product-Datasheets/3314.pdf Potentiometer vertical Bourns 3299W Potentiometer, horizontal, Alps RK163 Single, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk16/rk16.pdf Potentiometer horizontal Alps RK09L Double, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk09l/rk09l.pdf.

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