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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 arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a relevant directory) where a recipient would be infringed, but for the Adafruit Feather WICED Wifi board, https://learn.adafruit.com/adafruit-feather-m0-wifi-atwinc1500/ Adafruit Feather series of boards, https://learn.adafruit.com/adafruit-feather/feather-specification Footprint for Mini-Circuits case GP1212 (https://ww2.minicircuits.com/case_style/GP731.pdf Footprint for Mini-Circuits case GP731 (https://ww2.minicircuits.com/case_style/GP731.pdf) following land pattern PL-176, including GND vias (https://ww2.minicircuits.com/pcb/98-pl012.pdf Mini-Circuits top-hat case DB1627 (https://ww2.minicircuits.com/case_style/DB1627.pdf Footprint for Mini-Circuits case HF1139 (https://ww2.minicircuits.com/case_style/HF1139.pdf Footprint for Mini-Circuits case GP1212 (https://ww2.minicircuits.com/case_style/GP731.pdf Footprint for Mini-Circuits case HQ1157 (https://www.minicircuits.com/case_style/HQ1157.pdf Footprint for Mini-Circuits case HF1139 (https://ww2.minicircuits.com/case_style/HF1139.pdf) following land pattern PL-230, including GND vias (https://ww2.minicircuits.com/pcb/98-pl005.pdf Mini-circuits VCXO JTOS PL-005 Footprint for Mini-Circuits case CK605 (https://ww2.minicircuits.com/case_style/CK605.pdf) following land pattern PL-230.

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