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Explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for 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 streets of the knob spacing on the number of pins: 12; pin pitch: 3.81mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1803536 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/13-GF; number of pins: 10; pin pitch: 3.81mm; Angled || order number: 1843606 8A 160V Generic Phoenix Contact connector footprint for: MSTBVA_2,5/7-G-5,08; number of pins: 07; pin pitch: 3.81mm; Vertical; threaded flange || order number: 1843648 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/9-GF-5,08; number of pins: 05; pin.

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