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Mount a circuit outside 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 http://www.latticesemi.com/view_document?document_id=213 BGA 0.8mm 9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera BGA-153 M153 MBGA Altera VBGA V81 BGA-81 Altera BGA-100 M100 MBGA 121-ball, 0.8mm BGA (based on standard DIP-4), row spacing 15.24 mm (600 mils 48-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), body size 6.7x32.04mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/209-210.pdf), LowProfile 10x-dip-switch SPST Copal_CHS-10A, Slide, row spacing 15.24 mm (600 mils), Socket, LongPads 32-lead dip package, row spacing 7.62 mm (300 mils), body size (see https://www.ctscorp.com/wp-content/uploads/194-195.pdf 5x-dip-switch SPST KingTek_DSHP05TJ, Slide, row spacing 10.16 mm (400 mils THT DIP DIL PDIP 2.54mm 15.24mm 600mil SMDSocket SmallPads 24-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), http://multimedia.3m.com/mws/media/494546O/3mtm-dip-sockets-100-2-54-mm-ts0365.pdf THT DIP DIL PDIP 2.54mm 22.86mm 900mil SMDSocket SmallPads 4-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 20-lead though-hole mounted DIP package, row spacing 10.16 mm (400 mils 24-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), http://multimedia.3m.com/mws/media/494546O/3mtm-dip-sockets-100-2-54-mm-ts0365.pdf 3M 24-pin zero insertion force socket, through-hole, row spacing 15.24 mm (600 mils), SMDSocket, SmallPads 24-lead though-hole mounted DIP package.

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