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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 https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm BGA-64, 10x10 raster, 4.618x4.142mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l072kz.pdf WLCSP-49, 7x7 raster, 3.89x3.74mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f031k6.pdf WLCSP-25, 5x5 raster, 2.423x2.325mm package, pitch 0.4mm; see section 7.3 of http://www.st.com/resource/en/datasheet/stm32l011k3.pdf WLCSP-36, 6x6 raster, 2.61x2.88mm package, pitch 0.4mm; see section 7.1.1 of http://www.st.com/resource/en/datasheet/stm32f401ce.pdf WLCSP-49, 7x7 raster, 3.89x3.74mm package, pitch 0.5mm; see section 7.5 of http://www.st.com/resource/en/datasheet/DM00257211.pdf WLCSP-64, 8x8 raster, 4.539x4.911mm package, pitch 0.5mm; see section.

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