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Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** 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 BGA 0.8mm 9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera BGA-153 M153 MBGA Altera UBGA U169 BGA-169 BGA-200, 14.5x10.0mm, 200 Ball, 12x22 Layout, 0.8x0.65mm Pitch, http://www.issi.com/WW/pdf/43-46LQ32256A-AL.pdf Altera BGA-256 M256 MBGA BGA-256, dimensions: https://www.xilinx.com/support/documentation/package_specs/ft256.pdf, design rules: https://www.xilinx.com/support/documentation/user_guides/ug1099-bga-device-design-rules.pdf Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.65mm UFBGA-32, 6x6, 4x4mm package, pitch 0.4mm; see section 6.1 of http://www.st.com/resource/en/datasheet/stm32f405og.pdf WLCSP-100, 10x10 raster, 8x8mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/DM00257211.pdf WLCSP-49, 7x7 raster, 3x3mm package, pitch 0.8mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f103tb.pdf LFBGA-144, 12x12 raster, 10x10mm package, pitch 0.5mm; see section 36.2.3 of http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42363-SAM-D11_Datasheet.pdf WLCSP-56, 7x8 raster, 3.170x3.444mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32l476me.pdf WLCSP-81, 9x9 raster, 4.039x3.951mm package, pitch 0.4mm; see section 7.3 of http://www.st.com/resource/en/datasheet/stm32l011k3.pdf WLCSP-36, 6x6 raster, 2.605x2.703mm package, pitch 0.5mm; see section 7.1 of http://www.st.com/resource/en/datasheet/DM00213872.pdf WLCSP-64, 8x8 raster, 4.466x4.395mm package, pitch 0.5mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32l476me.pdf WLCSP-81, 9x9 raster, 4x4mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f301r8.pdf WLCSP-49, 7x7 raster, 2.999x3.185mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/DM00213872.pdf WLCSP-64, 8x8 raster, 4.539x4.911mm package, pitch 0.8mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f051t8.pdf WLCSP-36, 6x6 raster, 2.605x2.703mm package, pitch 0.4mm; see section 7.8 of http://www.st.com/resource/en/datasheet/DM00387108.pdf Texas Instruments, DSBGA, area grid, YBG pad definition, 0.8875x1.3875mm, 5 Ball, 2x3 Layout, 0.4mm Pitch, https://assets.nexperia.com/documents/data-sheet/PCMFXUSB3S_SER.pdf ST WLCSP-18, ST Die ID 466, 1.86x2.14mm, 18 Ball, X-staggered 13x8 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g071eb.pdf ST WLCSP-36, 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, area grid, NSMD, YZP0005 pad definition, https://www.ti.com/lit/ds/symlink/lmg1020.pdf, https://www.ti.com/lit/ml/mxbg078z/mxbg078z.pdf BGA 6 0.4 YFF0006 Texas Instruments, DSBGA, area grid, NSMD, YZP0005 pad definition, 0.95x1.488mm, 6 Ball, 2x3 Layout, 0.35mm Pitch, https://www.st.com/resource/en/datasheet/stm32h7a3ai.pdf ST WLCSP-156, ST die ID 456, 1.94x2.4mm, 20 Ball, 4x5 Layout, 0.4mm Pitch, https://assets.nexperia.com/documents/data-sheet/PCMFXUSB3S_SER.pdf ST WLCSP-18, ST Die ID 466, 1.86x2.14mm, 18 Ball, X-staggered 7x5 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g483me.pdf ST WLCSP-81, ST die ID 472, 4.36x4.07mm, 81 Ball, 9x9 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32wb55vc.pdf ST WLCSP-100, ST die ID 480, 4.57x4.37mm, 132 Ball.

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