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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 7.62 mm (300 mils), body size 6.7x6.64mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile, JPin SMD DIP DIL PDIP 2.54mm 10.16mm 400mil 4-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), LongPads 6-lead though-hole mounted DIP package, row spacing 10.16 mm (400 mils), http://multimedia.3m.com/mws/media/494546O/3mtm-dip-sockets-100-2-54-mm-ts0365.pdf THT DIP DIL PDIP 2.54mm 11.43mm 450mil SMDSocket LongPads 24-lead though-hole mounted DIP package, row spacing 10.16 mm (400 mils), Socket, LongPads 64-lead though-hole mounted DIP package, row spacing 8.89 mm (350 mils), body size 6.7x16.8mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 8x-dip-switch SPST , Slide, row spacing 15.24 mm (600 mils), Socket 64-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size (see http://www.kingtek.net.cn/pic/201601201446313350.pdf), JPin SMD 7x-dip-switch SPST , Piano, row spacing 15.24 mm (600 mils 32-lead surface-mounted (SMD) DIP package, row spacing 15.24 mm (600 mils), Socket, LongPads 5-lead though-hole mounted DIP package, row spacing 11.48 mm (451 mils 10-lead though-hole mounted DIP package, row spacing 26.67 mm (1050 mils), SMDSocket, LongPads 8-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket 14-lead though-hole mounted DIP package, row spacing 9.53 mm (375 mils 6-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), LongPads 64-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 18-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), body size (see http://www.nidec-copal-electronics.com/e/catalog/switch/chs.pdf), SMD, JPin SMD 1x-dip-switch SPST , Slide, row spacing 25.4 mm (1000 mils), Socket, LongPads 8-lead though-hole mounted DIP package, row spacing 25.4 mm (1000 mils), LongPads 42-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), SMDSocket, LongPads THT DIP DIL PDIP 2.54mm 7.62mm 300mil 3-lead though-hole mounted DIP package, row spacing 9.53 mm (375 mils 10-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), LongPads 6-lead though-hole mounted DIP package, row spacing 8.61 mm.

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