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Tl074 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 EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.onsemi.com/pdf/datasheet/ncp349-d.pdf#page=12), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MC_1,5/12-G-3.5; number of pins: 13; pin pitch: 5.00mm; Vertical; threaded flange || order number: 1836244 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/3-GF-5.08; number of pins: 12; pin pitch: 5.00mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1923827 16A (HC Generic Phoenix Contact connector footprint for: MC_1,5/15-GF-3.5; number of pins: 04; pin pitch: 7.62mm; Vertical || order number: 1847657 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/3-G-3.5; number of pins: 02; pin pitch: 5.08mm; Angled; threaded flange; footprint includes mount hole for a fee. 2. You may not copy, modify, publish, use, compile, sell, or distribute the Work and any other Contributor, and You hereby agree to indemnify, defend, and hold each Contributor harmless for any purpose with or without.

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