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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 VBGA V81 BGA-81 Altera BGA-100 M100 MBGA 121-ball, 0.8mm BGA (based on standard DIP-4), row spacing 8.89 mm (350 mils), SMDSocket, SmallPads 14-lead though-hole mounted DIP package, row spacing 22.86 mm (900 mils), Socket, LongPads THT DIP DIL PDIP 2.54mm 11.43mm 450mil SMDSocket LongPads 64-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils 64-lead though-hole mounted DIP package, row spacing 8.89 mm (350 mils), SMDSocket, SmallPads 28-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), Socket 28-lead though-hole mounted DIP package, row spacing 7.62 mm.

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