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(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 POE DCDC-Converter, 60W POE, Silvertel, pitch 2.54mm, package size 1006 3 pins IR-LED, diameter 3.0mm, 2 pins LED_Rectangular, Rectangular, Rectangular size 5.0x5.0mm^2 2 pins LED_Rectangular, Rectangular, Rectangular size 5.0x2.0mm^2 z-position of LED center 3.0mm, 2 pins LED_Rectangular, Rectangular, Rectangular size 5.0x2.0mm^2 z-position of LED center 1.6mm, 2 pins, http://www.kingbright.com/attachments/file/psearch/000/00/00/L-47XEC(Ver.9A).pdf LED Round Rectangular size 5.0x2.0mm^2 z-position of LED center 1.0mm 2 pins LED diameter 5.0mm z-position of LED center 6.0mm 2 pins diameter 3.0mm z-position of LED center 2.0mm, 2 pins, pitch 2.54mm, drill diameter 0.8mm wire loop as test Point, diameter 5.0mm 2 pins diameter 3.0mm 2 pins diameter 1.8mm size 1.8x2.4mm^2 z-position of LED center 4.9mm, 2 pins diameter 3.0mm z-position of LED center 2.0mm 2 pins LED_Rectangular, Rectangular, Rectangular size 5.0x2.0mm^2 z-position of LED center 3.0mm, 2 pins LED, diameter 3.0mm, 2 pins, diameter 5.0mm THT rectangular pad as test point, pitch 2.54mm, package size 1006 3 pins LED, diameter 3.0mm, 2 pins, diameter 5.0mm z-position of LED center 1.6mm 2 pins LED, diameter 5.0mm z-position of LED center 9.0mm 2 pins LED, diameter 3.0mm, hole diameter 2.0mm THT pad THT pad as test Point, square 1.5mm side length SMD rectangular pad as test point, loop diameter2.6mm, hole diameter 0.7mm THT pad as test point, pitch 2.54mm, size 5.54x6.2mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO.

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