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BackTl074 and support 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 either internal or external clock sources cycle between 0v and 5v max // gate out (j4/j10) // clock out (j5/j12 // glide in (j16/j17) // cv out // cv out // 1 rotary switch with LED, generic D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | Tayda | A-159 | | | | | | | R14 | 1 | 1 | TL074 | Quad operational amplifier, DIP-14"/>