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And cascade out is easier done via skywiring; only one tl074 and support 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 single output POE DCDC-Converter, 60W POE, Silvertel, pitch 2.54mm, size 15.7x6.2mm^2, drill diamater 1.3mm, pad diameter 2.4mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block 4Ucon ItemNo. 10696, vertical (cable from top), 12 pins, pitch 5mm, size 60x10mm^2, drill diamater 1.4mm, 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 205-00052 pitch 5mm size 25x9.8mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00294, 9 pins, pitch 3.5mm, size 21x6.5mm^2, drill diamater 1.3mm, 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 Metz Connect Type059_RT06305HBWC, 5 pins, pitch 5mm, size 15x12.6mm^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_MetzConnect THT terminal block RND 205-00011 pitch 5mm size 10x9.8mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00290 pitch 5.08mm length 26mm diameter 9mm Resistor, Axial_DIN0922 series, Axial, Horizontal, pin pitch=7.5mm, , length*diameter=5.1*3.1mm^2, http://www.vishay.com/docs/45231/arseries.pdf C Axial series Axial Horizontal pin pitch 20mm length 12mm diameter 5mm height 11mm Non-Polar Electrolytic Capacitor CP, Radial_Tantal series, Radial, pin pitch=15.80mm, , length*width=41.9*19.1mm^2, Vishay, TJ7, http://www.vishay.com/docs/34079/tj.pdf L_Toroid Horizontal series Radial pin pitch 5.00mm diameter 12.0mm Fastron 11P Inductor, Radial series, Radial, pin pitch=10.00mm, , length*width=11.5*6.9mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 10.00mm length 11.5mm width 6.9mm Capacitor C, Rect series, Radial, pin pitch=10.00mm, , length*width=13*3mm^2, Capacitor, http://www.wima.com/EN/WIMA_FKS_3.pdf, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 7.50mm length 9mm width 3.2mm Capacitor C, Radial series, Radial, pin pitch=2.50mm, , diameter=7.0mm, Tantal Electrolytic Capacitor CP, Radial_Tantal series, Radial, pin pitch=7.62mm, , length*diameter=20.32*12.7mm^2, Vishay, IHA-201, http://www.vishay.com/docs/34014/iha.pdf Inductor Axial series Axial Vertical pin pitch 45mm length 42mm diameter 23.0mm Electrolytic Capacitor CP Radial series.

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