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Any work based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else 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 SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W single output POE DCDC-Converter, 60W POE, Silvertel, pitch 2.54mm, package size 0604 3 pins Ceramic Resomator/Filter 7.0x2.5mm^2, length*width=7.0x2.5mm^2 package, package length=8.0mm, package width=3.5mm, 3 pins THT ceramic resonator filter DSS6 SMD Resomator/Filter Murata DSS6, http://cdn-reichelt.de/documents/datenblatt/B400/DSN6NC51H.pdf, length*width=7.0x2.5mm^2 package, package length=7.0mm, package width=2.5mm, 2 pins LED diameter 3.0mm z-position of LED center 2.0mm, 2 pins, http://www.kingbright.com/attachments/file/psearch/000/00/00/L-5603QBC-D(Ver.12B).pdf LED_Oval Oval Oval size 5.2x3.8mm^2 2 pins LED, diameter 10.0mm, 2 pins, pitch 3.5mm, size source Multi-Contact FLEXI-E_0.25 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 5273-12A example for new part number: 22-27-2061, 6 Pins per row (http://www.molex.com/pdm_docs/sd/530480210_sd.pdf), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-40DS-0.5V, 40 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 12 Pin (https://www.diodes.com/assets/Datasheets/PAM2306.pdf), generated with kicad-footprint-generator Harting har-flexicon vertical Harting har-flexicon series connector, DF3EA-11P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing⟨=en&documentid=0001163317), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 43045-1600 (alternative finishes: 43045-142x), 7 Pins per row (http://www.molex.com/pdm_docs/sd/431602102_sd.pdf), generated with kicad-footprint-generator JST SH series connector, LY20-6P-DLT1, 3 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 2.5/9-V-5.0-EX Terminal Block, 1732438 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732438), generated with kicad-footprint-generator ipc_noLead_generator.py WLCSP-35, 2.168x2.998mm, 35 Ball, 7x5 Layout, 0.4mm Pitch, https://pdfserv.maximintegrated.com/package_dwgs/21-100489.PDF WLCSP-25, 5x5 raster, 2.423x2.325mm package, pitch 0.4mm; http://ww1.microchip.com/downloads/en/devicedoc/atmel-8235-8-bit-avr-microcontroller-attiny20_datasheet.pdf#page=208 WLCSP-16, 1.409x1.409mm, 16 Ball, 4x4 Layout, 0.5mm Pitch, https://www.nxp.com/docs/en/package-information/98ASA00869D.pdf#page=1 MAPBGA 14x14x1.18 PKG, 14.0x14.0mm, 289 Ball, 17x17 Layout, 0.5mm Pitch, https://www.ti.com/lit/ds/symlink/dac80508.pdf Analog LFCSP, 16 Pin (https://toshiba.semicon-storage.com/info/docget.jsp?did=12858&prodName=TLP291-4), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-124-02-xxx-DV-BE-LC, 24 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 5 times 2.5 mm² wires, reinforced insulation, conductor diameter 0.9mm, outer diameter 4.4mm, size source Multi-Contact FLEXI-E 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 2.5 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Connector Phoenix Contact connector footprint.

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