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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 SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W single output DC/DC Murata MGJ2DxxxxxxSC, 19.5x9.8x12.5mm, 5.2kVDC Isolated, 1W, dual output, SIP package style, https://power.murata.com/data/power/ncl/kdc_mej1.pdf Abracon Miniature Ceramic Smd Crystal ABM8AIG https://abracon.com/AIGcrystals/ABM8AIG.pdf, 3.2x2.5mm^2 package SMD Crystal G8, 3.2x1.5mm^2 package SMD Crystal MicroCrystal CC1V-T1A series https://www.microcrystal.com/fileadmin/Media/Products/32kHz/Datasheet/CC1V-T1A.pdf, hand-soldering, 8.0x3.7mm^2 package SMD Crystal G8, hand-soldering, 3.2x1.5mm^2 package SMD Crystal Oscillator Seiko Epson SG-210 https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-210SED, hand-soldering, 2.5x2.0mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002LB https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC, 5.0x3.2mm^2 package Abracon Miniature Ceramic Smd Crystal ABM10 http://www.abracon.com/Resonators/ABM10.pdf SMD SMT SPST EVQPUJ EVQPUA SMD SMT SPST EVQPL EVQPT Coto Technologies SPST Reed Switch CT10-XXXX-G1 Coto Technologies SPST Reed Switch CT05-XXXX-G1 Coto Reed SPST Switch Coto Technologies SPST Reed Switch CT10-XXXX-G4 ALPS 5.2mm Square Low-profile Type (Surface Mount) SKQG Series, Without stem, http://www.alps.com/prod/info/E/HTML/Tact/SurfaceMount/SKQG/SKQGAEE010.html TL3305 Series Tact Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, without Boss Ultra-small-sized Tactile Switch Ultra-small-sized Tactile Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, without Boss Ultra-small-sized Tactile Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, without Boss Ultra-small-sized Tactile Switch Ultra-small-sized Tactile Switch SPST Slide 8.61mm 338mil SMD SMD 9x-dip-switch SPST CTS_Series194-9MSTN, Piano, row spacing 15.24 mm (600 mils 32-lead surface-mounted (SMD) DIP package, row spacing 9.53 mm (375 mils), Clearance8mm 20-lead surface-mounted (SMD) DIP package, row spacing 9.53 mm (375 mils), Clearance8mm 18-lead surface-mounted (SMD) DIP package, row spacing 10.16 mm (400 mils 14-lead surface-mounted (SMD) DIP package, row spacing 25.4 mm (1000 mils), LongPads 18-lead though-hole mounted DIP package, row.

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