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BackVCF 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 https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (http://www.produktinfo.conrad.com/datenblaetter/175000-199999/181293-da-01-de-TO92_Temperatursensor_PT1000_32209225.pdf Molded Japan Transistor Package 7x4x9mm^3, http://rtellason.com/transdata/2sb734.pdf Non Isolated Modified TO-220 7pin Package, see http://www.farnell.com/datasheets/5793.pdf Power Integration Y Package SIPAK, Horizontal, RM 5.08mm, see http://www.onsemi.com/pub/Collateral/FFPF10F150S-D.pdf TO-220F-2 Vertical RM 2.54mm TO-220-4 Horizontal RM 5.45mm TO-3P-3, Vertical, RM 5.45mm, , see https://toshiba.semicon-storage.com/ap-en/design-support/package/detail.TO-3P(N).html TO-3P-3 Vertical RM 2.286mm SIPAK.
- (end 156.1525 126.75 (end 159.25 112.
- Pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=93, NSMD pad definition Appendix A.
- The LED legs to reach.