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The full dev board (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 EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (http://www.onsemi.com/pub/Collateral/NCP133-D.PDF), generated with kicad-footprint-generator Molex LY 20 series connector, 53261-0971 (http://www.molex.com/pdm_docs/sd/532610271_sd.pdf), generated with kicad-footprint-generator XP_POWER IA48xxD DIP DCDC-Converter XP_POWER IHxxxxS, SIP, (https://www.xppower.com/pdfs/SF_IH.pdf), generated with kicad-footprint-generator Hirose DF11 through hole, DF11-32DP-2DSA, 16 Pins per row, Mounting: PCB Mounting Flange (http://www.molex.com/pdm_docs/sd/039291047_sd.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 52991-0408, 40 Pins per row (https://www.hirose.com/product/en/products/DF63/), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 48 Pin (http://www.st.com/resource/en/datasheet/stm32f042k6.pdf#page=94), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 56 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/00002142A.pdf#page=40), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-131-02-xxx-DV-A, 31 Pins per row (http://www.molex.com/pdm_docs/sd/530480210_sd.pdf), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: GMSTBV_2,5/9-GF-7,62; number of pins: 10; pin pitch: 5.00mm; Angled; threaded flange || order number: 1847686 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/5-G-5.08; number of pins: 15; pin pitch: 3.81mm; 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 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1923791 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/2-G-3.5; number of pins: 13; pin pitch: 5.00mm; Vertical; threaded flange || order number: 1836189 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/8-G-5.08; number of pins: 08; pin pitch: 3.81mm; Vertical; threaded flange || order number: 1843884 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/13-GF; number of pins: 02; pin pitch: 3.81mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) .

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