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BackDiode 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 other Binary files /dev/null and b/Images/IMG_6770.JPG differ Binary files /dev/null and b/Hardware/Panel/precadsr_panel.png differ Cell (black box KASSU / AO Grid is metric (mm),