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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 date of any warranty; and give any third party, for a single 1 mm² wires, reinforced insulation, conductor diameter 2.4mm, outer diameter 3.5mm, size 50x8.3mm^2, drill diamater 1.2mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00237 pitch 5.08mm length 10mm width 3mm Capacitor C, Rect series, Radial, pin pitch=15.00mm, , length*width=19*8mm^2, Capacitor, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 27.94mm 5W length 20mm width 6.4mm height 6.4mm Resistor, Axial_Power series, Axial, Vertical, pin pitch=7.62mm, , length*diameter=30*8mm^2, Fastron, 77A, http://cdn-reichelt.de/documents/datenblatt/B400/DS_77A.pdf Inductor Axial series Axial Horizontal pin pitch 5.08mm size 81.3x9.8mm^2 drill 1.3mm pad 2.6mm Terminal Block Phoenix MKDS-3-12-5.08 pitch 5.08mm length 14.5mm diameter 5.8mm Fastron HBCC Inductor, Axial series, Axial, Horizontal, pin pitch=25mm, , length*diameter=19*9.5mm^2, http://cdn-reichelt.de/documents/datenblatt/B300/STYROFLEX.pdf C Axial series Axial Horizontal pin pitch 10.00mm length 11.0mm width 3.5mm Capacitor C, Rect series, Radial, pin pitch=5.08*12.70mm^2, , length*width=21*10mm^2, muRATA, 5100, http://www.murata-ps.com/data/magnetics/kmp_5100.pdf L_CommonMode_Toroid Vertical series Radial pin pitch 7.62mm length 5.2mm diameter 2.7mm Diode, DO-15 series, Axial, Horizontal, pin pitch=20.3mm, 5W, length*width=21.3*4.8mm^2, https://www.bourns.com/pdfs/PWR4412-2S.pdf Resistor Bare_Metal_Element series Bare Metal Strip/Wire, Horizontal, pin pitch=25mm, , length*diameter=19*9mm^2, http://cdn-reichelt.de/documents/datenblatt/B300/STYROFLEX.pdf C Axial series Axial Horizontal pin pitch 3.00mm diameter 7mm width 2.5mm Capacitor C, Rect series, Radial, pin pitch=5.00mm, , diameter=7.0mm, Tantal Electrolytic Capacitor C Radial series Radial pin pitch 5.00mm diameter 10mm Electrolytic Capacitor CP Radial series Radial pin pitch 27.50mm length 29mm width 9.6mm Capacitor C, Rect series, Radial, pin pitch=10.00mm, diameter=35mm, height=50mm, Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Vertical pin pitch 5.00mm diameter 4.5mm Fastron MECC Inductor, Axial series, Axial, Vertical, pin pitch=2.54mm, 0.167W, length*diameter=3.6*1.6mm^2, http://cdn-reichelt.de/documents/datenblatt/B400/1_4W%23YAG.pdf Resistor Axial_DIN0516 series Axial Horizontal pin pitch 25.4mm 3W length 22.2mm width 8mm Capacitor C, Rect series, Radial, pin pitch=7.50mm, , diameter=14mm, Electrolytic Capacitor C Radial series Radial pin pitch 25.4mm 0.5W = 1/2W length 9mm diameter 3.2mm Resistor, Axial_DIN0411 series, Axial, Horizontal, pin pitch=7.62mm, 0.167W, length*diameter=3.6*1.6mm^2.

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