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Uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, based on the bottom (in mm). If you don't want the hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1843813 8A 160V Generic Phoenix Contact connector footprint for: GMSTBVA_2,5/12-G-7,62; number of pins: 15; pin pitch: 5.08mm; Vertical || order number: 1803484 8A 160V Generic.

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