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Schematics and .ino file 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, 27.0x27.0mm, 756 Ball, 32x32 Layout, 0.8mm Pitch, https://www.micron.com/-/media/client/global/documents/products/data-sheet/dram/ddr3/4gb_ddr3l.pdf#page=27 FBGA-96, 14.0x8.0mm, 96 Ball, 9x16 Layout, 0.8mm Pitch, https://www.ti.com/lit/ml/mpbg777/mpbg777.pdf BGA 289 0.8 ZAV S-PBGA-N289 Texas Instruments, DSBGA-6, 0.704x1.054mm, NSMD, YKA pad definition, 0.95x1.488mm, 6 Ball, 2x3 Layout, 0.4mm Pitch, https://www.ti.com/lit/gpn/ina234 Texas Instruments, DSBGA, 3.33x3.488x0.625mm, 49 ball 7x7 area grid, YZR pad definition Appendix A Kintex-7 and Zynq-7000 BGA, 34x34 grid, 35x35mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=265, NSMD pad definition Appendix A BGA 225 0.8 CSGA225 Spartan-7 BGA, 15x15 grid, 13x13mm package, pitch 0.5mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f031k6.pdf WLCSP-25, 5x5 raster, 2.097x2.493mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32l152zd.pdf WLCSP-64, 8x8 raster, 3.357x3.657mm package, pitch 0.65mm WLP-4, 2x2 raster, 0.73x0.73mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f469ni.pdf WLCSP-180, 13x14 raster, 5.537x6.095mm package, pitch 0.8mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32f446ze.pdf UFBGA-144, 12x12 raster, 10x10mm package.

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