synth_tools

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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 dial. Set to zero if you don't want the ring. RingWidth = 0; // [0:No, 1:Yes] // 0 if indicator faces notch, 180 if it faces.

9.452922e+01 4.255000e+01 facet normal -4.589668e-01 -8.884534e-01.
20-lead, 3 x switching (normalling.
-0.909897 0.284801 0.301622 facet.
-0.0979739 -0.995118 -0.0119198 facet normal.

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