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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 https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm Highspeed card edge connector for 1.6mm PCB's with 70 contacts (not polarized Highspeed card edge connector for 2.4mm PCB's with 60 contacts (not polarized Highspeed card edge card connector socket for 1.57mm PCBs, vertical, alignment pins (source: https://suddendocs.samtec.com/prints/hsec8-1xxx-xx-xx-dv-x-xx-footprint.pdf 0.8 mm BGA-64, 10x10 raster, 8x8mm package, pitch 0.5mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f103tb.pdf LFBGA-144, 12x12 raster, 7x7mm package, pitch 0.5mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f446ze.pdf WLCSP-81, 9x9 raster, 4x4mm package, pitch 0.65mm VFBGA-86, 6.0x6.0mm, 86 Ball, 10x10 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32wb15cc.pdf#page=119 ST WLCSP-52, ST die ID 483, 3.73x4.15mm, 115 Ball, Y-staggered 11x21 Layout, 0.35mm Pitch, https://www.st.com/resource/en/datasheet/stm32h7a3ai.pdf ST WLCSP-156, ST die ID 471, 4.437x4.456mm, 100 Ball, 10x10 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g071eb.pdf ST WLCSP-36, ST die ID 469, 4.02x4.27mm, 81 Ball, 9x9 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g483me.pdf ST WLCSP-81, ST die ID 467, 3.09x3.15mm, 52 Ball, X-staggered 7x5 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, https://www.ti.com/lit/ds/symlink/sn74lvc1g17.pdf#page=42, https://www.ti.com/lit/ml/mxbg018l/mxbg018l.pdf BGA 5 0.5 YZP Texas Instruments, DSBGA, 1.5195x1.5195x0.600mm, 8 ball 3x3 area grid, YZT, 1.86x1.36mm, 12 Ball, 3x4 Layout, 0.5mm Pitch, http://www.ti.com/lit/ds/symlink/tps63000.pdf 3x3mm Body, 0.5mm Pitch http://www.st.com/resource/en/datasheet/ecmf02-2amx6.pdf UQFN DFN 0.5 ST 20-Lead Plastic Thin Shrink Small Outline (SSO/Stretched SO), see https://www.vishay.com/docs/83831/lh1533ab.pdf SSO Stretched SO SOIC Pitch 1.27 SSOP-8 2.9 x2.8mm Pitch 0.65mm Slug Up (PowerSO-20) [JEDEC MO-166] (http://www.st.com/resource/en/datasheet/tda7266d.pdf, www.st.com/resource/en/application_note/cd00003801.pdf HSOP, 32 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation EC), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-129-02-xxx-DV-BE-A, 29 Pins per row (https://www.hirose.com/product/en/products/DF63/), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-34S-0.5SH, 34 Pins per row (http://www.molex.com/pdm_docs/sd/1053141208_sd.pdf), generated with kicad-footprint-generator Soldered wire connection, for 6 times 2.5 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MPT-0,5-12-2.54 pitch 2.54mm size 20.78x6.5mm^2 drill 1.1mm pad 2.1mm Terminal Block 4Ucon ItemNo. 19965 pitch 3.5mm size 32.5x8.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00028, 7 pins, pitch 2.5mm, size 15.5x5mm^2, drill diamater 1.4mm, pad diameter 1.4mm, outer diameter 3.5mm, size 46.5x8.3mm^2, drill diamater 1.15mm, pad diameter 2.2mm, see http://www.mouser.com/ds/2/324/ItemDetail_1725656-920552.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix MKDS-3-11-5.08 pitch 5.08mm 2W length 13.0mm width 4.0mm Capacitor C, Rect series, Radial, pin pitch=22.50mm, , length*width=24*12.8mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf.

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