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Else VCF MK's Diode 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 the ~Env output. You can use one on both sides, or do partial planes where convenient. Hardware/PCB/precadsr/potsetc.kicad_sch Normal file Unescape "Name": "Top Silk Screen" "Name": "Top Solder Paste" "Name": "Bottom Silk Screen" "Name": "Top Solder Mask" "Notes": "Type: dielectric layer 1 (from F.Cu to B.Cu)" "Name": "Bottom Solder Mask" "Name": "Bottom Solder Mask" "Notes": "Type.

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