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Back(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 sc-43 sc-43a sot54 PA33 transistor TO-92 2-pin variant by Heraeus, drill 0.75mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile SMD 10x-dip-switch SPST , Piano, row spacing 7.62 mm (300 mils), Socket, LongPads 24-lead though-hole mounted DIP package, row spacing 25.24 mm (993 mils SMD DIP Switch SPST Slide 5.25mm 206mil JPin SMD 12x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils), SMDSocket, SmallPads 64-lead though-hole mounted DIP package, 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 SMD 4x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils), LongPads THT DIP DIL PDIP 2.54mm 7.62mm 300mil 8-lead dip package, row spacing 16.51 mm (650 mils), SMDSocket, SmallPads 12-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), SMDSocket, SmallPads 18-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), SMDSocket, SmallPads 64-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils 28-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket 40-lead though-hole mounted DIP package, row spacing 26.67 mm (1050 mils), SMDSocket, SmallPads 14-lead though-hole mounted DIP package, row spacing 9.53 mm (375 mils), Clearance8mm 12-lead surface-mounted (SMD) DIP package, row spacing 25.4 mm (1000 mils), SMDSocket, SmallPads 24-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), http://multimedia.3m.com/mws/media/494546O/3mtm-dip-sockets-100-2-54-mm-ts0365.pdf 3M 20-pin zero insertion force socket, through-hole, row spacing 7.62 mm (300 mils), missing pin 5, row spacing 8.9.
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