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BackElse 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 https://www.schmitzbits.de/ms20.html which is what MK uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 .../Unseen Servant/Unseen Servant.kicad_pro | 85 Synth Mages Power Word Stun.kicad_sch SD, SMD, right-angle, push-pull (https://media.digikey.com/PDF/Data%20Sheets/Hirose%20PDFs/DM3D-SF.pdf 1.10mm Pitch microSD Memory Card Connector, Normal Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Reverse Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Surface Mount, http://www.molex.com/pdm_docs/sd/1054440001_sd.pdf USB TYPE C, VERT RCPT PCB, SMT, https://www.amphenolcanada.com/StockAvailabilityPrice.aspx?From=&PartNum=12401610E4%7e2A USB C Type-C Receptacle SMD USB 2.0 Type C Receptacle, GCT, 16P, top mounted, horizontal, 5A: https://gct.co/files/drawings/usb4105.pdf USB C Type-C USB3 receptacle SMD USB Micro-B receptacle, through-hole, vertical, http://katalog.we-online.de/em/datasheet/614105150721.pdf usb micro receptacle vertical Hirose series connector, 502443-0570 (http://www.molex.com/pdm_docs/sd/5024430270_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-145-02-xxx-DV, 45 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-4P-1.25DS%2820%29/), generated with kicad-footprint-generator JST XH series connector, BM07B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-102-02-xxx-DV-BE-LC, 2 Pins (http://www.molex.com/pdm_docs/sd/559320530_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-110-02-xxx-DV-BE-A, 10 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 ipc_noLead_generator.py TDFN, 12 Pads, No exposed, http://www.st.com/resource/en/datasheet/stm6600.pdf TDFN, 14 Pin (http://www.ti.com/lit/ds/symlink/lm5161.pdf#page=34), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 56 Pin (https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf#page=634), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 24 Pin (JEDEC MO-194 Var AB https://www.jedec.org/document_search?search_api_views_fulltext=MO-194), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 6, Wuerth electronics 9775031360 (https://katalog.we-online.com/em/datasheet/9775031360.pdf), generated with kicad-footprint-generator Harting har-flexicon series connector, B2P-VH-B (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 16 Pin (https://toshiba.semicon-storage.com/info/docget.jsp?did=12855&prodName=TLP290-4), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 36 Pin (JEDEC MO-153 Var BA https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator JST VH series connector, S08B-J21DK-GGXR (http://www.jst-mfg.com/product/pdf/eng/eJFA-J2000.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-120-02-xxx-DV-A, 20 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MSTB_2,5/13-GF; number of pins: 03; pin pitch: 7.62mm; Angled; threaded flange .
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