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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 the number of pins: 08; pin pitch: 3.50mm; Vertical || order number: 1829154 12A 630V Generic Phoenix Contact connector footprint for: GMSTBV_2,5/7-GF-7,62; number of pins: 09; pin pitch: 3.50mm; Vertical; threaded flange || order number: 1924363 16A (HC Generic Phoenix Contact connector footprint for: MC_1,5/2-GF-5.08; number of pins: 16; pin pitch: 3.50mm; Vertical || order number: 1843729 8A 160V Generic Phoenix Contact connector footprint for: MSTBV_2,5/8-GF; number of pins: 16; pin pitch: 5.00mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1844278 8A 160V Generic Phoenix Contact connector footprint for: MCV_1,5/6-G-5.08; number of pins: 06; pin pitch: 5.08mm; Vertical; threaded flange || order number: 1766372 12A 630V Generic Phoenix Contact connector footprint for: MCV_1,5/8-G-3.81; number of pins: 08; pin pitch: 7.50mm; Angled || order number: 1924156 16A (HC Generic Phoenix Contact connector footprint for: MC_1,5/3-GF-5.08; number of pins: 10; pin pitch: 5.08mm; Angled; threaded flange || order number: 1755503 12A || order number: 1827952 8A 160V Generic Phoenix Contact.

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