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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 cylindrical edge of the hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1806290 12A 630V Generic Phoenix Contact connector footprint for: GMSTBA_2,5/11-G; number of pins: 08; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1806287 12A 630V Generic Phoenix Contact connector footprint for: MCV_1,5/15-G-3.5; number of pins: 05; pin pitch: 3.81mm; Angled || order number: 1924172 16A (HC Generic Phoenix Contact connector footprint for: MC_1,5/7-GF-3.5; number of pins: 11; pin pitch: 5.08mm; Vertical; threaded flange || order number: 1924088 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/7-G-5.08; number of pins: 15; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1847550 8A 320V Generic Phoenix Contact SPT 2.5/6-H-5.0-EX 1732425 Connector Phoenix Contact connector footprint for: MCV_1,5/12-GF-3.81; number of pins: 06; pin pitch: 5.08mm; Vertical || order number: 1766437 12A 630V Generic Phoenix Contact connector footprint for: MC_1,5/13-G-3.81; number of pins: 10; pin pitch: 5.00mm; Vertical || order number: 1827923 8A 160V Generic Phoenix Contact connector footprint for: MC_1,5/6-GF-3.81; number of pins: 13; pin pitch: 5.08mm; Vertical; threaded flange || order number: 1757556 12A || order number: 1843295 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/10-GF-5,08; number of pins: 11; pin pitch: 7.62mm; Vertical || order number: 1923966 16A (HC Generic Phoenix Contact connector footprint for: GMSTBA_2,5/10-G; number of pins: 13; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount.

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