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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 https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm Highspeed card edge connector for 1.6mm PCB's with 08 contacts (polarized Highspeed card edge connector for PCB's with 08 contacts (not polarized Highspeed card edge connector for 1.6mm PCB's with 40 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 60 contacts (polarized Highspeed card edge card connector socket for 1.57mm PCBs, vertical, alignment pins, weld tabs (source: https://suddendocs.samtec.com/prints/hsec8-1xxx-xx-xx-dv-x-xx-footprint.pdf Samtec Micro Mate Discrete Wire Terminal Strip, 1.00 mm Pitch, Single Row, Horizontal (Right Angle) (source: https://suddendocs.samtec.com/prints/t1m-single-row-footprint.pdf Samtec Micro Mate Discrete Wire Terminal Strip, 1.00 mm Pitch, Single Row, Vertical (source: https://suddendocs.samtec.com/prints/t1m-single-row-footprint.pdf Samtec Micro Mate Discrete Wire Terminal Strip, 1.00 mm Pitch, Single Row, Horizontal (Right Angle) (source: https://suddendocs.samtec.com/prints/t1m-single-row-footprint.pdf TE Connectivity, HDI, Wire-to-Board, Fully Shrouded, Header: https://www.te.com/usa-en/product-440055-2.datasheet.pdf connector header hdr horizontal right-angle shrouded fully-shrounded 440054-2 2-440054-2 4-440054-2 6-440054-2 2-440054-6 4-440054-6 6-440054-6 TE Connectivity, HDI, Wire-to-Board, Fully Shrouded, Header: https://www.te.com/usa-en/product-440055-2.datasheet.pdf connector header hdr horizontal vertical shrouded fully-shrounded 440055-2 2-440055-2 4-440055-2 6-440055-2 8-440055-2 TE Connectivity Buchanan WireMate connector, Poke-In series, 2-way, 4.0mm pitch, AWG18-22 (0.3255-0.823mm2), https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F2834006%7FB6%7Fpdf%7FEnglish%7FENG_CD_2834006_B6.pdf%7F2834006-1 TE-Connectivity Micro-MaTch Vertical 215079-4 7-215079-4 TE-Connectivity Micro-MaTch Vertical 1-215079-0 8-215079-10 TE-Connectivity Micro-MaTch Vertical 215079-8 7-215079-8 USB 3.0, type A, right angle (http://www.molex.com/pdm_docs/sd/467651301_sd.pdf hdmi micro type d right angle USB3 type A Plug, Horizontal, http://cnctech.us/pdfs/1001-011-01101.pdf USB-A receptacle horizontal through-hole USB B receptable with flange, https://cdn.amphenol-icc.com/media/wysiwyg/files/drawing/10118193.pdf Dustproof Micro USB Typ-B (http://www.molex.com/pdm_docs/sd/1051330001_sd.pdf Micro-USB SMD Typ-B GCT Molex Vertical Micro USB Typ-B (http://www.molex.com/pdm_docs/sd/1051330031_sd.pdf Micro USB Typ-B (http://www.molex.com/pdm_docs/sd/1051330031_sd.pdf Micro USB https://gct.co/files/drawings/usb3076.pdf Micro-USB SMD Typ-B Vertical Molex Vertical Micro USB Type C, Right Angle, Surface Mount, ZIF, 15 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ038187.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 72 Pin (http://www.analog.com/media/en/technical-documentation/data-sheets/ADAU1452_1451_1450.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VLGA, 4 Pin (https://toshiba.semicon-storage.com/info/docget.jsp?did=12884&prodName=TLP291), generated with kicad-footprint-generator Hirose series connector, B3B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, SM07B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-105-02-xxx-DV-A, 5 Pins per row (http://www.molex.com/pdm_docs/sd/1053141208_sd.pdf), generated with kicad-footprint-generator JST PH series connector, B11B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Resistor SMD 2512 (6332 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size from: http://datasheets.avx.com/AVX-HV_MLCC.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 30 Pin (JEDEC MO-153 Var BC https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with.

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