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Replacement arrives - Wiring SW15 (once/stop) and cascade out is easier done via skywiring; only one 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 http://www.latticesemi.com/view_document?document_id=213 BGA 0.8mm 9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.35mm; https://datasheets.maximintegrated.com/en/ds/MAX40200.pdf WLP-9, 1.448x1.468mm, 9 Ball, 3x3 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32l562ce.pdf ST WLCSP-90, ST die ID 468, 3.15x3.13mm, 49 Ball, 7x7 Layout, 0.8mm Pitch, https://www.micron.com/-/media/client/global/documents/products/data-sheet/dram/ddr3/4gb_ddr3l.pdf#page=26 ST uTFBGA-36, 0.25mm pad, 3.6x3.6mm, 36 Ball, 6x6 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g051f8.pdf#page=102 ST WLCSP-25, ST die ID 456, 1.94x2.4mm, 20 Ball, 4x5 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g483me.pdf ST WLCSP-81, ST die ID 479, 3.56x3.52mm, 64 Ball, 8x8 Layout, 0.4mm Pitch, https://www.nxp.com/docs/en/package-information/SOT1963-1.pdf ST LFBGA-354, 16.0x16.0mm, 354 Ball, 19x19 Layout, 0.5mm Pitch, http://www.ti.com/lit/ds/symlink/txb0104.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf BGA 12 0.5 R-XBGA-N12 Texas Instruments, QFM MOF0009A, 6x8x2mm (http://www.ti.com/lit/ml/mpsi063a/mpsi063a.pdf QFN, 41 Pin (http://www.ti.com/lit/ml/mpqf506/mpqf506.pdf QFN, 28 Pin (https://www.akm.com/akm/en/file/datasheet/AK5394AVS.pdf#page=23), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MSTBVA_2,5/12-G-5,08; number of pins: 05; pin pitch: 3.81mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924583 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/5-GF-5.08; number of pins: 11; pin pitch: 3.81mm; Vertical || order number: 1847521 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/7-GF-3.81; number of pins: 09; pin pitch: 3.50mm; Vertical; threaded flange || order number: 1847673 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/9-G-5.08; number of pins: 15; pin pitch: 3.81mm; Angled || order number: 1924554 16A (HC Generic Phoenix Contact connector footprint for: MSTBA_2,5/7-G-5,08; number of pins: 11; pin pitch: 5.08mm; Angled || order number: 1803507 8A 160V Generic Phoenix Contact connector footprint for: GMSTBA_2,5/10-G-7,62; number of pins: 04; pin pitch: 3.81mm; Vertical; threaded flange || order number: 1766424 12A 630V Generic Phoenix Contact connector footprint for: MC_1,5/7-G-3.81; number of pins: 12; pin pitch: 5.08mm; Angled .

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