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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 the lower 5 mm Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm or 16 mm vertical board mount module ACDC-Converter, Murata, 5W, ClassB, https://www.murata.com/products/productdata/8809982558238/KAC-BAC05.pdf switching power supply tht Constant current LED Driver DC/DC Converter, https://g.recomcdn.com/media/Datasheet/pdf/.fYUQjOlW/.t2a80a771bdbb0ef300f7/Datasheet-93/RCD-24.pdf DCDC-Converter, 30W POE, Silvertel, pitch 2.54mm, size 23.32x6.5mm^2, drill diamater 1.15mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00023_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block 4Ucon ItemNo. 10704 vertical pitch 5mm size 76.5x15mm^2 drill 1.2mm pad 2.3mm terminal block RND 205-00015 pitch 5mm size 50x12.6mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00022, 12 pins, pitch 10mm, size 52.3x14mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/2138224.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-16-5.0-H, 16 pins, single row Through hole angled pin header SMD 1x36 2.54mm single row style2 pin1 right Through hole straight pin header, 2x26, 1.00mm pitch, single row Through hole angled socket strip, 1x13, 2.54mm pitch, 6mm pin length, single row style1 pin1 left Surface mounted socket strip THT 1x16 5.08mm single row Surface mounted pin header SMD 1x37 2.00mm single row Through hole angled socket strip SMD 1x20 2.00mm single row (from Kicad 4.0.7), script generated Through hole socket strip THT 1x24 2.00mm single row (https://gct.co/files/drawings/bc065.pdf), script generated Through hole angled socket strip, 2x38, 2.00mm pitch, 6.35mm socket length, double rows Through hole pin header THT 1x11 5.08mm single row style1 pin1 left Surface mounted pin header SMD 1x24 2.00mm single row Through hole straight socket strip, 2x03, 1.27mm pitch, double rows Through hole pin header THT 1x38 1.00mm single row style2.

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