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And .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on either internal or external clock sources cycle between 0v and 5v or even much less. - One SPST switch to disable reset (run once). Momentary-normal-off pushbutton to manually reset. - One potentiometer per step, to.

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