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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 (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92 leads molded, wide, drill 0.75mm (see NXP sot054_po.pdf TO-92 leads molded, narrow, drill 0.75mm (http://www.produktinfo.conrad.com/datenblaetter/175000-199999/181293-da-01-de-TO92_Temperatursensor_PT1000_32209225.pdf Molded Japan Transistor Package 7x4x9mm^3, http://rtellason.com/transdata/2sb734.pdf Non Isolated Modified TO-220 7pin Package, see http://www.farnell.com/datasheets/5793.pdf Power Integration Y Package SIPAK, Horizontal, RM 2.54mm, staggered type-1 TO-220F-15 Vertical RM 1.7mm PentawattF- MultiwattF-5 TO-220F-5, Vertical, RM 1.27mm, Multiwatt-7, staggered type-1 TO-220-11, Horizontal, RM 2.54mm, see http://ww1.microchip.com/downloads/en/DeviceDoc/20005685A.pdf TO-247-5 Horizontal RM 0.97mm Multiwatt-9 staggered type-1 TO-220F-9, Vertical, RM 5.45mm, , see http://www.onsemi.com/pub/Collateral/340AC.PDF TO-3PB-3 Vertical RM 2.29mm IPAK TO-251-3, Vertical, RM 0.97mm, Multiwatt-9, staggered type-2 TO-220-4, Vertical, RM 2.54mm, see http://www.vishay.com/docs/88898/b2m.pdf DIL DIP PDIP 5.08mm 7.62mm 300mil SMDSocket SmallPads 22-lead though-hole mounted DIP package, row spacing 5.25 mm (206 mils), body size 10.8x14.26mm 5x-dip-switch SPST KingTek_DSHP05TJ, Slide, row spacing 7.62 mm (300 mils 14-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 20-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 5-lead though-hole mounted DIP package, row spacing 8.61 mm (338 mils), body size 6.7x11.72mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 10x-dip-switch SPST Copal_CHS-10B, Slide, row spacing 5.25 mm (206 mils), body size 10.8x11.72mm 4x-dip-switch SPST KingTek_DSHP04TS, Slide, row spacing 5.25 mm (206 mils), body size 10.8x24.42mm 9x-dip-switch SPST CTS_Series194-9MSTN, Piano, row spacing 5.9 mm (232 mils), body size 6.7x32.04mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/209-210.pdf), LowProfile DIP Switch SPST Slide 8.9mm 350mil SMD 2x-dip-switch SPST KingTek_DSHP02TJ, Slide.

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