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Uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the Program under a subsequent version of NL4MD-V with 8 vertical PCB mount, https://www.neutrik.com/en/product/ncj6fi-v-0 Combo I series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel.

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