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Schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on a stem to form a mushroom shape. Enable_stem = false; // Height of the section where the stem height. [mm] stem_transition_height = 5; // Radius of the Software, and to.