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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 the cylindrical edge of the plastic walls. Clf_wall = 2; holeWidth = 10.16; // If you don't want a large timer-knob style pointer? TimerKnob=0; // [0:No, 1:Yes] // Would you like a.

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