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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 DC/DC Murata MGJ2DxxxxxxSC, 19.5x9.8x12.5mm, 5.2kVDC Isolated, 1W, single output, SIP package style, https://power.murata.com/data/power/ncl/kdc_mej1.pdf Abracon Miniature Ceramic SMD Crystal EuroQuartz EQ161 series http://cdn-reichelt.de/documents/datenblatt/B400/PG32768C.pdf, 3.2x1.5mm^2 package SMD Crystal SERIES SMD0603/4 http://www.petermann-technik.de/fileadmin/petermann/pdf/SMD0603-4.pdf, hand-soldering, 6.0x3.5mm^2 package SMD Crystal TXC 7M http://www.txccrystal.com/images/pdf/7m-accuracy.pdf, 3.2x2.5mm^2 package SMD Crystal Seiko Epson SG-8002JC https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC, hand-soldering, 7.0x5.0mm^2 package SMD Crystal Seiko Epson MC-146 https://support.epson.biz/td/api/doc_check.php?dl=brief_MC-156_en.pdf, 6.7x1.5mm^2 package SMD Crystal EuroQuartz MQ series http://cdn-reichelt.de/documents/datenblatt/B400/MQ.pdf, hand-soldering, 7.0x5.0mm^2 package SMD Crystal MicroCrystal CC4V-T1A series http://cdn-reichelt.de/documents/datenblatt/B400/CC4V-T1A.pdf, 5.0x1.9mm^2 package SMD Crystal MicroCrystal CM9V-T1A series http://www.microcrystal.com/images/_Product-Documentation/01_TF_ceramic_Packages/01_Datasheet/CM9V-T1A.pdf, hand-soldering.

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