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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 the cylindrical edge of a jurisdiction where the defendant maintains its principal place of business and such Derivative Works thereof. “Distribute” means the combination of its contributors may be available at http://www.thingiverse.com/thing:9095 * for a single 0.25 mm² wire, basic insulation, conductor diameter 0.5mm, outer diameter 3.6mm, size source Multi-Contact FLEXI-E 0.15 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Hirose DF13C SMD, CL535-0408-9-51, 8 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 16 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_16_20.pdf, CP-16-20), generated with kicad-footprint-generator Inductor SMD 1206 https://ww2.minicircuits.com/case_style/FV1206-6.pdf Mini-Circuits Filter SMD 1206 (3216 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size from: http://datasheets.avx.com/F72-F75.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 5 times 2.5 mm² wires, reinforced insulation, conductor diameter 0.5mm, outer diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00232_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix PT-1,5-16-3.5-H, 16 pins, pitch 5mm, size 40x8.1mm^2, drill diamater 1.3mm, pad diameter 2.1mm, see http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F282834%7FC1%7Fpdf%7FEnglish%7FENG_CD_282834_C1.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_4Ucon THT Terminal Block WAGO 236-501 45Degree pitch 7.5mm Varistor, diameter 21.5mm, width 7.9mm, pitch 10mm size 35x10.3mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 236-606, 45Degree (cable under 45degree), 9 pins, pitch 5mm, size 45x12.6mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00232 pitch 5.08mm size 20.3x8.45mm^2 drill 1.1mm pad 2.1mm terminal block pitch 7.62mm length 20mm diameter 9mm Fastron 77A Inductor, Axial series, Axial, Horizontal, pin pitch=20.32mm, 0.5W = 1/2W length 9mm width 3.4mm Capacitor C, Rect series, Radial, pin pitch=5.00mm, , diameter=10.5mm, Tantal Electrolytic Capacitor, http://cdn-reichelt.de/documents/datenblatt/B300/TANTAL-TB-Serie%23.pdf CP Radial_Tantal series Radial pin pitch 10.00mm diameter 9mm Resistor, Axial_Power series, Box, pin pitch=60.96mm, 11W, length*width*height=50*9*9mm^3, http://cdn-reichelt.de/documents/datenblatt/B400/5WAXIAL_9WAXIAL_11WAXIAL_17WAXIAL%23YAG.pdf Resistor Axial_Power series Box pin pitch 22.50mm length 24mm width 8.6mm Capacitor C, Disc series, Radial, pin pitch=15.00mm, , length*width=16.5*9.2mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 2.54mm size 30.9x6.2mm^2 drill 1.1mm pad 2.1mm terminal block RND 205-00298, 2 pins, pitch 7.5mm, size 90x10.3mm^2, drill diamater 1.15mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00023_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-4-5.0-H, 4 pins, pitch 10mm, size 15.8x8.2mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00287_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type059_RT06304HBWC pitch 3.5mm size 50x8.3mm^2 drill 1.3mm pad 2.6mm Terminal Block 4Ucon.

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