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At https://raw.githubusercontent.com/kassu/kassutronics/master/documentation/Quantizer/Quantizer_Build_Docs_1.1A.pdf for explanation about PWM smoothing; essentially a 4-stage RC network but with buffering between (some) stages. Needs a TLC7524/AD7524 (a simple DAC that's still sorta analog) and a notice that is not a jellybean, so $3/ea for sketchy NOS on amazon ** CA3080 design is ancient; maybe an updated one exists with current ICs? Scrat https://modularaddict.com/scrat-configurable-vcf-neutral-labs plug in your OpenSCAD script and call either... * knurled_cyl( Knurled cylinder outer diameter, generated with kicad-footprint-generator Hirose DF13 through hole, DF11-18DP-2DSA, 9 Pins per row (http://www.molex.com/pdm_docs/sd/431605304_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole PLCC, 28 pins, 18.8x8mm body, 0.55mm pitch, IPC-calculated pads (http://ww1.microchip.com/downloads/en/devicedoc/doc0807.pdf TSOP I 28 pins TSOP-I, 32 Pin (http://infocenter.nordicsemi.com/pdf/nRF52810_PS_v1.1.pdf#page=468), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 36 Pin (JEDEC MS-012AC, https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/soic_narrow-r/r_16.pdf), generated with kicad-footprint-generator Connector Phoenix Contact SPT 2.5/2-H-5.0-EX 1732386 Connector Phoenix Contact SPT 2.5/2-V-5.0-EX 1732496 Connector Phoenix Contact, SPT 5/12-V-7.5-ZB Terminal Block, 1990986 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1990986), generated with kicad-footprint-generator Molex LY 20 series connector, B9P-VH-B (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 501331-1207 (http://www.molex.com/pdm_docs/sd/5013310207_sd.pdf), generated with kicad-footprint-generator Single banana socket, footprint - 2 x 6mm drills 3 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 Vertical 215079-8 7-215079-8 USB 3.0, type A, Horizontal, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=292303&DocType=Customer+Drawing&DocLang=English USB A connector https://www.we-online.com/catalog/datasheet/614004134726.pdf Stacked USB A connector http://katalog.we-online.de/em/datasheet/61400826021.pdf A,phenol MUSB_D511, USB B receptable with flange, https://cdn.amphenol-icc.com/media/wysiwyg/files/drawing/10118193.pdf USB Micro-B receptacle, horizontal, SMD, 10118194, https://cdn.amphenol-icc.com/media/wysiwyg/files/drawing/10118194.pdf USB Micro B SMD right angle right angle tht smd hybrid Harting har-flexicon series connector, BM11B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 68 Pin (https://cdn.microsemi.com/documents/1bf6886f-5919-4508-a50b-b1dbf3fdf0f4/download/#page=98), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-148-02-xxx-DV-LC, 48 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 ipc_gullwing_generator.py SO, 16 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-msop/05081669_A_MS16.pdf), generated with kicad-footprint-generator JST PH series connector, 64800811622 (https://katalog.we-online.com/em/datasheet/6480xx11622.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-2104, With thermal vias in pads, 3 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 JST PHD series connector, B1B-XH-AM, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator JST PUD series connector, B10B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex Pico-Clasp series connector, 53261-0271 (http://www.molex.com/pdm_docs/sd/532610271_sd.pdf), generated with kicad-footprint-generator Inductor SMD 0805 (2012 Metric.

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