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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 the other work under copyright law: that is Incompatible With Secondary Licenses", as defined caaf12f2da replaces FIREBALL mask/etch with silkscreen Add footprint items for panel holes; separate panel and pcb into different files Fireball/Fireball.kicad_pcb | 8194 Fireball/Fireball_panel.kicad_pro | 6 Kosmo_panel | 1 | 1 | SW_3PDT_x3 | Switch, single pole double throw, separate symbols K switch SPST right angle, PTS645VL83-2 LFS tactile switch http://www.ckswitches.com/media/1479/kmr2.pdf CK components KMR2 tactile switch SPST right angle, PTS645VL31-2 LFS tactile switch SPST right angle, https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3f.pdf tactile switch SPST angled PTS645VL83-2 LFS tactile switch D reed switch, default-closed D SPDT reed switch K switch dual-pole double-throw DPDT 3pdt ON-ON D Push button switch | Dailywell | PAS6B2M1CESG2-5, PAS6B2M4CESG6-5, or PAS6B2M4CESG6-5 | Tayda | A-553.

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