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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 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, size 30.9x6.2mm^2, drill diamater 1.3mm, pad diameter 2.1mm, see http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F282834%7FC1%7Fpdf%7FEnglish%7FENG_CD_282834_C1.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-3-3-5.08 pitch 5.08mm 1W length 9.9mm diameter 3.6mm Diode, DO-15 series, Axial, Horizontal, pin pitch=15.24mm, , length*diameter=7.6*3.6mm^2, , http://www.diodes.com/_files/packages/DO-15.pdf Diode DO-15 series Axial Horizontal pin pitch 60mm length 55mm diameter 26mm height 45mm Electrolytic Capacitor CP, Axial series, Axial, Horizontal, pin pitch=25.4mm, 2W, length*diameter=15.5*5mm^2, http://cdn-reichelt.de/documents/datenblatt/B400/1_4W%23YAG.pdf Resistor Axial_DIN0309 series Axial Vertical pin pitch 22.00mm length 27mm width 9mm height 9mm Resistor, Axial_Power series, Axial, Horizontal, pin pitch=10.16mm, , length*width=26.67*13.97mm^2, Pulse, D, http://datasheet.octopart.com/PE-92112KNL-Pulse-datasheet-17853305.pdf L_Toroid Vertical series Radial pin pitch 7.11mm length 21.59mm width 8.38mm Pulse G L_Toroid, Vertical series, Radial, pin pitch=7.50mm, , diameter*width=16.0*5.0mm^2, Capacitor, http://www.vishay.com/docs/28535/vy2series.pdf C Disc series Radial pin pitch 22.50mm length 24mm diameter 7.5mm Electrolytic Capacitor CP, Radial series, Radial, pin pitch=7.37mm, 10W, length*width=16.1*9mm^2, http://www.vishay.com/docs/30218/cpcx.pdf Resistor Radial_Power series Radial pin pitch 35mm length 30mm diameter 15mm Electrolytic Capacitor CP, Axial series, Axial, Vertical, pin pitch=5.08mm, , length*diameter=16*9.5mm^2, Vishay, IM-10-37, http://www.vishay.com/docs/34030/im10.pdf Inductor Axial series Axial Vertical pin pitch 25mm length 18mm width 6mm Capacitor C, Rect series, Radial, pin pitch=7.37mm, 10W, length*width=16.1*9mm^2, http://www.vishay.com/docs/30218/cpcx.pdf Resistor Radial_Power series Radial pin pitch 7.50mm length 9mm diameter 3.2mm Resistor, Axial_DIN0411 series, Axial, Horizontal, pin pitch=12.7mm, 1W, length*diameter=9.9*3.6mm^2 Resistor Axial_DIN0411 series Axial Horizontal pin pitch 5.00mm diameter 10.5mm C, Disc series, Radial, pin pitch=27.50mm, , length*width=29*12.2mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 30.48mm 5W length 20mm width 6.4mm height 6.4mm Resistor, Axial_Power series, Box, pin pitch=86.36mm, 17W, length*width*height=75*9*9mm^3, http://cdn-reichelt.de/documents/datenblatt/B400/5WAXIAL_9WAXIAL_11WAXIAL_17WAXIAL%23YAG.pdf Resistor Axial_Power series Box pin pitch 5.00mm diameter 13mm Electrolytic Capacitor CP Axial series.

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