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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 http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, 27.0x27.0mm, 756 Ball, 32x32 Layout, 0.8mm Pitch, http://www.latticesemi.com/view_document?document_id=213 Analog Devices KS-4 (like EIAJ SC-82 Infineon PG-HDSOP-10-1 (DDPAK), 20.96x6.5x2.3mm, slug up (https://www.infineon.com/cms/en/product/packages/PG-HDSOP/PG-HDSOP-10-1/ HSOF-8-1 [TOLL] power MOSFET (http://www.infineon.com/cms/en/product/packages/PG-HSOF/PG-HSOF-8-2/ HSOF-8-2 [TOLL] power MOSFET (http://www.infineon.com/cms/en/product/packages/PG-HSOF/PG-HSOF-8-2/ HSOF-8-2 [TOLL] power MOSFET (http://www.infineon.com/cms/en/product/packages/PG-HSOF/PG-HSOF-8-3/ Infineon PG-TO-220-7, Tab as Pin 8, see e.g. Https://www.infineon.com/dgdl/Infineon-BTS50055-1TMC-DS-v01_00-EN.pdf?fileId=5546d4625a888733015aa9b0007235e9 Nexperia CFP15 (SOT-1289), https://assets.nexperia.com/documents/outline-drawing/SOT1289.pdf On Semiconductor ECH8, https://www.onsemi.com/pub/Collateral/318BF.PDF Low Profile DFS "Flat", see http://www.vishay.com/docs/88874/dfl15005.pdf SMD diode bridge Thermal enhanced ultra thin fine pitch quad flat package (http://www.st.com/resource/en/datasheet/stm8s003f3.pdf ST UQFN 6 pin connector, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F215079%7FY1%7Fpdf%7FEnglish%7FENG_CD_215079_Y1.pdf%7F215079-4 connector TE-Connectivity Micro-MaTch female-on-board top-entry thru-hole 16 pin with exposed pad 4.5x7mm (https://www.infineon.com/cms/en/product/packages/PG-DSO/PG-DSO-20-71/ Infineon SO package 20pin without exposed pad TSSOP, 14 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0137.PDF (T1433-2C)), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-0810, with PCB locator, 14 Pins per row, Mounting: Snap-in Plastic Peg PCB Lock (http://www.molex.com/pdm_docs/sd/039289068_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole straight pin header, 1x38, 2.54mm pitch, single row style1 pin1 left Surface mounted socket strip THT 2x13 2.54mm double row Through hole angled pin header, 2x29, 1.27mm pitch, 4.4mm socket length, single row Surface mounted pin header THT 1x29 2.54mm single row (https://gct.co/files/drawings/bc065.pdf), script generated Through hole straight socket strip, 2x24, 2.00mm pitch, single row Through hole angled pin header, 1x38, 1.00mm pitch, 2.0mm pin length, single row Through hole socket strip SMD 2x11 2.00mm double row Through hole IDC header, 2x25, 1.27mm pitch, 4.0mm pin length, double cols (from Kicad 4.0.7), script generated Surface mounted pin header SMD 1x15 2.00mm single row Through hole angled pin header SMD 2x20 1.00mm double row Through hole angled pin header SMD 1x03 2.54mm single row Surface mounted pin header THT 1x34 1.27mm single row.

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