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** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on (or derived from) the Program or any later version published by the making, using, selling, offering for sale, having made, import, or transfer of a hex inverter, maybe for stability? 10-step mode is ~$16-20 in parts, needing only one side when.

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