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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 SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W single output DC/DC, http://power.murata.com/data/power/ncl/kdc_cre1.pdf Isolated 1W or 2W Single Output SM DC/DC Converters 78sr3.3 78sr5 78sr9 78sr12 78srXX DCDC-Converter, RECOM, RECOM_R-78HB-0.5, SIP-3, pitch 2.54mm, package size 11.6x8.5x10.4mm^3, https://www.recom-power.com/pdf/Innoline/R-78Sxx-0.1.pdf dc-dc recom buck sip-12 pitch 2.54mm size 20.8x6.2mm^2 drill 1.1mm pad 2.1mm Terminal Block Phoenix MKDS-3-10-5.08 pitch 5.08mm length 14.5mm diameter 5.8mm Fastron HBCC Inductor, Axial series, Axial, Vertical, pin pitch=2.54mm, , length*diameter=9.5*4mm^2, Fastron, SMCC, http://cdn-reichelt.de/documents/datenblatt/B400/DS_SMCC_NEU.pdf, http://cdn-reichelt.de/documents/datenblatt/B400/LEADEDINDUCTORS.pdf Inductor Axial series Axial Vertical pin pitch 27.94mm 5W length 25mm width 9mm Capacitor C, Rect series, Radial, pin pitch=7.50mm, , diameter=13mm, Electrolytic Capacitor CP, Radial series, Radial, pin pitch=2.50mm, , length*width=4.6*5.5mm^2, Capacitor, http://www.wima.de/DE/WIMA_MKS_02.pdf C Rect series Radial pin pitch 25.4mm length 16mm diameter 6.3mm Fastron VHBCC Inductor, Axial series, Axial, Vertical, pin pitch=7.62mm, , length*diameter=11*4.5mm^2, Fastron, MECC, http://www.fastrongroup.com/image-show/21/MECC.pdf?type=Complete-DataSheet&productType=series Inductor Axial series Axial Horizontal pin pitch 45.72mm 9W length 38mm width 9mm height 9mm Resistor, Axial_Power series, Axial, Horizontal, pin pitch=35.56mm, , length*diameter=30*8mm^2, Fastron, 77A, http://cdn-reichelt.de/documents/datenblatt/B400/DS_77A.pdf Inductor Axial series Axial Horizontal pin pitch 10mm size 32.3x14mm^2 drill 1.15mm pad 3mm Terminal Block Phoenix MKDS-1,5-4, 4 pins, pitch 3.81mm, size 11.3x7.3mm^2, drill diamater 1.2mm, pad diameter 2.2mm, see http://www.mouser.com/ds/2/324/ItemDetail_1725672-916605.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT.

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