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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 Lattice caBGA-756, ECP5 FPGAs, 27.0x27.0mm, 756 Ball, 32x32 Layout, 0.8mm Pitch, https://www.ti.com/lit/ml/mpbg777/mpbg777.pdf BGA 289 0.8 ZAV S-PBGA-N289 Texas Instruments, DSBGA, 3.33x3.488x0.625mm, 49 ball 7x7 area grid, YZT, 1.86x1.36mm, 12 Ball, 4x3 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32l4p5ve.pdf ST WLCSP-115, ST die ID 469, 4.02x4.27mm, 81 Ball, 9x9 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g051f8.pdf#page=102 ST WLCSP-25, ST die ID 479, 3.56x3.52mm, 64 Ball, 8x8 Layout, 0.4mm Pitch, https://pdfserv.maximintegrated.com/package_dwgs/21-100168.PDF XBGA-121, 11x11 raster, 10x10mm package, pitch 0.5mm (http://www.analog.com/media/en/package-pcb-resources/package/56702234806764cp_24_3.pdf, http://www.analog.com/media/en/technical-documentation/data-sheets/ADL5801.pdf LFCSP VQ, 24 pin, exposed pad: 4.5x8.1mm, with thermal vias in pads, 6 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator Samtec HLE horizontal Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-108-02-xxx-DV-BE-LC, 8 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Hirose series connector, (https://www.stocko-contact.com/downloads/steckverbindersystem-raster-2,5-mm.pdf#page=15), generated with kicad-footprint-generator Mounting Hardware, inside through hole lga land grid array Bosch LGA, 8 Pin (http://www.fujitsu.com/downloads/MICRO/fsa/pdf/products/memory/fram/MB85RS16-DS501-00014-6v0-E.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, S5B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, BM03B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Soldered wire connection, for 3 times outer diameter, generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 42820-22XX, With thermal vias in pads, 5 Pins per row (http://www.molex.com/pdm_docs/sd/022035035_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole Mallory low-profile piezo buzzer, https://www.mspindy.com/specifications/AST1109MLTRQ.pdf Mallory low-profile piezo buzzer, https://www.mspindy.com/specifications/AST12140MLQ.pdf Buzzer, D12.2mm height 6.5mm, https://product.tdk.com/info/en/catalog/datasheets/piezoelectronic_buzzer_ps_en.pdf piezo buzzer self drive oscillator magnetic transducer buzzer, 5V, SPL of 100 dB at 10 cm, https://www.cuidevices.com/product/resource/pdf/cmt-8504-100-smt-tr.pdf Buzzer, Elektromagnetic Beeper, Summer, 6V-DC, Buzzer, Elektromagnetic Beeper, Summer, 12V-DC, Buzzer, Elektromagnetic Beeper, Summer, 12V-DC, Buzzer, Elektromagnetic Beeper, Summer, 1,5V-DC, Buzzer, Elektromagnetic Beeper, Summer, 1,5V-DC, Buzzer, Elektromagnetic Beeper, Summer, MagneticBuzzer Kobitone 254-EMB84Q-RO https://www.mouser.es/datasheet/2/209/KT-400385-1171904.pdf Buzzer Magnetic 9mm AT-0927-TT-6-R, http://www.puiaudio.com/pdf/AT-0927-TT-6-R.pdf Buzzer Magnetic 9mm AT-0927-TT-6-R, http://www.puiaudio.com/pdf/AT-0927-TT-6-R.pdf Buzzer Magnetic 9mm AT-0927-TT-6-R Buzzer, Elektromagnetic Beeper, Summer, 3-28V-DC, https://www.kynix.com/uploadfiles/pdf/AI-4228-TWT-R.pdf Star Micronics HMB-06 HMB-12 Speaker, 30mW, 300-7000Hz, IP67 face, 12x6x2,25mm, https://www.cuidevices.com/product/resource/cmr-12062s-67.pdf Gauge, Massstab, 10mm, CopperTop, Type 5, Gauge Massstab 50mm CopperTop Type 1 Gauge, Massstab, 10mm, CopperTop, Type 1, Copper Top.

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