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A vendor? VCF MK's Diode 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 SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W or 2W Single Output SM DC/DC Converters 78sr3.3 78sr5 78sr9 78sr12 78srXX DCDC-Converter, RECOM, RECOM_R-78B-2.0, SIP-3, pitch 2.54mm, size 10.620000000000001x6.5mm^2, drill diamater 1.2mm, pad diameter 2.6mm, see http://www.mouser.com/ds/2/324/ItemDetail_1935161-922578.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00063, 45Degree (cable under 45degree), 6 pins, pitch 5mm, size 30x12.6mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00248 pitch 10.2mm size 45.7x8.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00290 pitch 5.08mm size 15.2x9.8mm^2 drill 1.3mm pad 2.5mm terminal block Metz Connect Type175_RT02703HBLC, 3 pins, pitch 5mm, size 35x9mm^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_RND THT terminal block Metz Connect 360273, block size 5x4mm^2, drill diamater 1.3mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-1,5-3 pitch 5mm size 60x12.6mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 236-324, 45Degree (cable under 45degree), 24 pins, pitch 2.54mm, size 28.4x6.2mm^2, drill diamater 1.15mm, pad diameter 2.3mm, size source Multi-Contact FLEXI-xV 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP I, 32 pins, 18.4x8mm body (http://www.futurlec.com/Datasheet/Memory/628128.pdf), reverse mount TSOP I 28 pins TSOP-I, 32 Pin (https://www.st.com/resource/en/datasheet/stm32g071k8.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 2 times 0.25 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 3.5mm, size source Multi-Contact FLEXI-E 0.75 (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 Beam Socket Strip, HLE-149-02-xxx-DV-A, 49 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip.

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