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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 potentiometer for internal clock rate. Switches: One SPST switch to set output voltages. (10) - One potentiometer for internal clock rate. Switches: One SPST switch per step, to set output voltages. (10.

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