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Back~$6 in parts, needing only one tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an arduino nano (other options probably fine), two 74HC595 shift.
- 1x03 1.27mm single row Through hole IDC header.
- See http://microrato.ua.pt/main/Actividades/Estagios/Docs/IS485_6.pdf Sharp OPIC IS471F, see.
- Of http://www.st.com/resource/en/datasheet/stm32f042k6.pdf WLCSP-36, 6x6 raster.