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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 number of pins: 14; pin pitch: 3.81mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1843907 8A 160V Generic Phoenix Contact connector footprint for: MSTBV_2,5/11-GF; number of pins: 15; pin pitch: 3.50mm; Vertical; threaded flange || order number: 1843279 8A 160V Generic Phoenix Contact SPT 2.5/3-H-5.0 Terminal Block, 1990779 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1990779), generated with kicad-footprint-generator connector JST ZE series connector, SM02B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-106-02-xxx-DV-LC, 6 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, old mpn/engineering number: 1-770968-x, 2 Pins per row (http://www.molex.com/pdm_docs/sd/439151404_sd.pdf), generated with kicad-footprint-generator JST VH series connector, B03B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH41-30S-0.5SH, 30 Pins (http://www.molex.com/pdm_docs/sd/5024260810_sd.pdf), generated with kicad-footprint-generator Molex 734 Male header (for PCBs); Straight solder pin 1 x 1 mm, 734-154 , 24 Pins per row (http://www.molex.com/pdm_docs/sd/1053091203_sd.pdf), generated with kicad-footprint-generator JST ACH series connector, SM10B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 2.5/8-H-5.0 1991037 Connector Phoenix Contact connector footprint for: MSTB_2,5/9-GF; number of pins: 16; pin pitch: 5.08mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1777138 12A || order number: 1777167 12A || order number: 1844249 8A 160V Generic Phoenix Contact connector footprint for: MSTBV_2,5/4-GF-5,08; number of pins: 12; pin pitch: 3.81mm; Vertical; threaded flange || order number: 1806300 12A 630V Generic Phoenix Contact connector footprint for: MSTBVA_2,5/10-G; number of pins: 10; pin pitch: 7.50mm.

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