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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 https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (see NXP sot054_po.pdf TO-92 leads molded, narrow, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S_Wide package, drill 0.75mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile, JPin SMD 3x-dip-switch SPST Omron_A6S-310x, Slide, row spacing 8.89 mm (350 mils), SMDSocket, SmallPads 48-lead though-hole mounted DIP package, row spacing 5.08 mm (200 mils), body size (see http://www.kingtek.net.cn/pic/201601201417455112.pdf SMD 7x-dip-switch SPST , Piano, row spacing 9.53 mm (375 mils), Clearance8mm 20-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), body size (see http://omronfs.omron.com/en_US/ecb/products/pdf/en-a6s.pdf SMD DIP Switch SPST Slide 6.73mm 264mil SMD LowProfile SMD 3x-dip-switch SPST , Slide, row spacing 6.15 mm (242 mils), body size 6.7x19.34mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 5x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils), see https://www.vishay.com/docs/91361/hexdip.pdf THT DIP DIL ZIF 15.24mm 600mil 28-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils 32-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), body size 10.8x16.8mm 6x-dip-switch SPST Omron_A6H-6101, Slide, row spacing 15.24 mm (600 mils), Socket, LongPads THT DIP DIL PDIP SMDIP 2.54mm 25.24mm 993mil 42-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils 22-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), Socket, LongPads 14-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 22-lead though-hole mounted DIP package, row spacing 8.9 mm (350 mils), SMDSocket, SmallPads THT DIP DIL PDIP SMDIP 2.54mm 7.62mm 300mil 2x-dip-switch SPST , Slide, row spacing 10.16 mm (400 mils THT DIP DIL PDIP 2.54mm 22.86mm 900mil SMDSocket SmallPads 40-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 32-lead dip package, row spacing 25.24 mm (993 mils SMD DIP DIL PDIP 2.54mm 8.89mm 350mil SMDSocket LongPads 24-lead though-hole mounted DIP package, row spacing 5.08 mm (200 mils), body size 6.7x4.1mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/204.pdf), SMD SMD 6x-dip-switch SPST Omron_A6S-610x, Slide, row spacing 15.24 mm (600 mils), LongPads THT DIP DIL PDIP 2.54mm 26.669999999999998mm 1050mil SMDSocket LongPads 64-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 32-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 20-lead surface-mounted (SMD.

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