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VFBGA-86, 6.0x6.0mm, 86 Ball, 10x10 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g431c6.pdf ST WLCSP-49, ST die ID 456, 1.94x2.4mm, 20 Ball, 4x5 Layout, 0.4mm Pitch, https://www.ti.com/lit/ml/mxbg419/mxbg419.pdf, https://www.ti.com/lit/ds/symlink/tmp117.pdf Texas Instruments, DSBGA, 0.9x1.4mm, 6 bump 2x3 (perimeter) array, NSMD pad definition Appendix A Artix-7 BGA, 18x18 grid, 15x15mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=265, NSMD pad definition (http://www.ti.com/lit/ds/symlink/txb0102.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments BGA-289, 0.4mm pad, based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules schematic start, and some example modules.

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