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Ladder VCF 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 https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm BGA-64, 10x10 raster, 8x8mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f303r8.pdf WLCSP-49, 7x7 raster, 3.417x3.151mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l031f6.pdf WLCSP-25, 5x5 raster, 2.423x2.325mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103tb.pdf UFBGA-132, 12x12 raster, 10x10mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32l052t8.pdf WLCSP-36, 6x6 raster, 2.61x2.88mm package, pitch 0.4mm; see section 10.3 of https://www.parallax.com/sites/default/files/downloads/P8X32A-Propeller-Datasheet-v1.4.0_0.pdf 44-Lead Plastic Shrink Small Outline (SO), see https://www.elpro.org/de/index.php?controller=attachment&id_attachment=339 SO, 4 Pin (https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/0_Datasheets/Humidity/Sensirion_Humidity_Sensors_SHTC3_Datasheet.pdf Sensirion DFN-8 SHT3x-DIS (https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/2_Humidity_Sensors/Datasheets/Sensirion_Humidity_Sensors_SHT3x_Datasheet_digital.pdf 24-Lead Plastic Shrink Small Outline (ST)-4.4 mm Body [SOIC] (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf SOIC, 8 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0168.PDF), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 20 Pin (https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf), generated with kicad-footprint-generator JST PH series connector, BM14B-GHS-TBT (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-116-02-xx-DV-TE, 16 Pins (http://www.molex.com/pdm_docs/sd/547220804_sd.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-0730, 7 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 2 times 2.5 mm² wires, basic insulation, conductor diameter 2mm, see http://www.produktinfo.conrad.com/datenblaetter/550000-574999/556444-da-01-de-LEITERPLATTENKL__PTSM_0_5__4_2_5_V_THR.pdf, script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block 4Ucon ItemNo. 10703 vertical pitch 3.5mm size 38.5x7.6mm^2 drill 1.2mm pad 2.4mm Terminal Block WAGO 236-209, 45Degree (cable under 45degree), 8 pins, pitch 5mm, size 15x12.6mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00026, 5 pins, pitch 5.08mm, size 20.3x8.45mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00067_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-205 45Degree pitch 5mm Varistor, diameter 9mm, width 3.8mm, pitch 5mm size 10x9mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00069 pitch 7.5mm Varistor, diameter 7mm, width 5.1mm, pitch 10mm size 75x8.1mm^2 drill 1.3mm pad 2.6mm terminal block RND 205-00289, 4 pins, pitch 2.5mm, size 8x5mm^2, drill diamater 1.1mm, pad diameter 2.3mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single.

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