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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 https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S package, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot519-1_po.pdf SSOP16: plastic shrink small outline package; 44 leads; body width 4.4 mm (http://toshiba.semicon-storage.com/info/docget.jsp?did=30523&prodName=TBD62783APG SSOP20: plastic shrink small outline package; 28 leads; body width 4.4 mm; (see NXP sot054_po.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (see NXP sot054_po.pdf TO-126-2, Horizontal, RM 1.27mm, staggered type-1, see http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-to-220/to-220_5_05-08-1421.pdf?domain=www.linear.com, https://www.diodes.com/assets/Package-Files/TO220-5.pdf TO-220-5 Vertical RM 5.08mm TO-126-3, Horizontal, RM 1.7mm, IIPAK, I2PAK, see http://pdf.datasheetcatalog.com/datasheet/irf/iris4011.pdf TO-262-5 Vertical RM 2.54mm TO-220-3, Vertical, RM 1.27mm, staggered type-1, see http://www.st.com/resource/en/datasheet/l298.pdf TO-220-15 Vertical RM 2.54mm IIPAK I2PAK TO-262-3, Vertical, RM 1.7mm, staggered type-1, see http://www.ti.com/lit/ds/symlink/lmd18200.pdf TO-220-15, Vertical, RM 2.54mm, staggered type-2, see http://www.st.com/resource/en/datasheet/l298.pdf TO-220-15 Horizontal RM 10.9mm TO-264-2, Vertical, RM 1.7mm, Pentawatt, Multiwatt-5, staggered type-1, see http://www.ti.com/lit/ds/symlink/lm3886.pdf TO-220F-11 Vertical RM 1.7mm IIPAK I2PAK TO-262-5, Horizontal, RM 1.27mm, MultiwattF-15, staggered type-2 TO-220F-5, Vertical, RM 2.54mm, staggered type-2, see http://www.st.com/resource/en/datasheet/l298.pdf TO-220-15 Vertical RM 1.27mm Multiwatt-7 staggered type-2 TO-220-7 Horizontal RM 1.7mm Pentawatt Multiwatt-5 TO-220-7, Vertical, RM 1.7mm, staggered type-2, see http://www.ti.com/lit/ds/symlink/lm3886.pdf TO-220F-11 Vertical RM 2.286mm SIPAK, Vertical, RM 5.08mm, see https://www.centralsemi.com/PDFS/CASE/TO-220-2PD.PDF TO-220-2 Vertical RM 2.54mm staggered type-2 TO-220F-7, Vertical, RM 2.54mm, see https://www.diodes.com/assets/Package-Files/TO126.pdf TO-126-2 Horizontal RM 5.475mm SOT-93 TO-220-2, Horizontal, RM 1.7mm, PentawattF-, MultiwattF-5, staggered type-2 TO-220-9, Horizontal, RM 3.81mm, see https://www.onsemi.com/pub/Collateral/NJL3281D-D.PDF TO-264-5 Horizontal RM 0.97mm Multiwatt-9 staggered type-2 TO-220-7 Vertical RM 1.27mm Multiwatt-7 staggered type-1 TO-220-9 Vertical 2.54mm Pitch Multiwatt 8 TO-220-9, Vertical, RM 5.08mm, see http://cdn-reichelt.de/documents/datenblatt/A400/W005M-W10M_SEP.PDF diode bridge OnSemi SDIP-4L, see https://www.onsemi.com/pdf/datasheet/df10s1-d.pdf OnSemi Diode Bridge SDIP-4L SMD diode bridge MBLS, see http://www.vishay.com/docs/89959/mbl104s.pdf http://www.vishay.com/docs/88854/padlayouts.pdf Diode Polymer Protected Zener Diode Littelfuse LS Nexperia CFP3 (SOD-123W), https://assets.nexperia.com/documents/outline-drawing/SOD123W.pdf Diode, 5KPW series, Axial, Horizontal, pin pitch=35mm, , length*diameter=29*10mm^2, Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Horizontal pin pitch 3.50mm diameter 8mm Electrolytic Capacitor CP Radial series Radial pin pitch 26mm length 20mm width 6.4mm height 6.4mm Resistor, Axial_Power series, Axial, Horizontal, pin pitch=27.5mm, , length*diameter=22*10.5mm^2, http://cdn-reichelt.de/documents/datenblatt/B300/STYROFLEX.pdf C Axial series Axial Horizontal pin pitch 49mm length 42.5mm diameter 20mm Electrolytic Capacitor CP, Radial series, Radial, pin pitch=37.50mm, , length*width=41.5*35mm^2, Capacitor, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 86.36mm 17W length 75mm width 9mm height 9mm Resistor, Axial_DIN0922 series, Axial, Vertical, pin pitch=5.08mm, , length*diameter=24*7.5mm^2, Fastron, MESC, http://cdn-reichelt.de/documents/datenblatt/B400/DS_MESC.pdf Inductor Axial series.

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