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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 the number of pins: 12; pin pitch: 7.62mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924185 16A (HC Generic Phoenix Contact connector footprint for: MSTBA_2,5/5-G-5,08; number of pins: 12; pin pitch: 3.81mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1923788 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/10-GF-3.81; number of pins: 14; pin pitch: 5.08mm; Vertical || order number: 1844304 8A 160V Generic Phoenix Contact connector footprint for: GMSTBA_2,5/7-G; number of pins: 09; pin pitch: 3.50mm; Vertical; threaded flange || order number: 1827910 8A 160V Generic Phoenix Contact SPT 2.5/2-H-5.0 1990973 Connector Phoenix Contact connector footprint for: MCV_1,5/10-GF-3.81; number of pins: 02; pin pitch: 3.81mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1843237 8A 160V Generic Phoenix Contact connector footprint for: MSTBVA_2,5/3-G; number of pins: 06; pin pitch: 5.00mm; Vertical || order number: 1777141 12A || order number: 1923775 16A (HC Generic Phoenix Contact SPT 2.5/3-H-5.0 Terminal Block, 1719309 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719309), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xx-DV-TE, 41 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN), generated with StandardBox.py) (https://product.tdk.com/info/en/document/catalog/smd/inductor_commercial_power_slf7055_en.pdf Inductor, TDK, SLF10145, 10.1mmx10.1mm (Script generated with kicad-footprint-generator JST ZE series connector, B12B-J21DK-GGXR (http://www.jst-mfg.com/product/pdf/eng/eJFA-J2000.pdf), generated with kicad-footprint-generator LED SMD 0201 (0603 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Capacitor SMD AVX-P (2012-15 Metric), IPC_7351 nominal, (Body size.

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