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Job! See PDF 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 momentary-on button to advance the step manually. This requires hardware de-bouncing to avoid putting any UX connections on the https://www.onsemi.com/pub/Collateral/NCP115-D.PDF Panasonic HQFN-16, 4x4x0.85mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HQFN016-A-0404XZL_EN.pdf Panasonic HSON-8, 8x8x1.25mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HSON008-A-0808XXI_EN.pdf QFN, 12 Pin (https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MIC2207-2MHz-3A-PWM-Buck-Regulator-DS20006470A.pdf#page=22), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 50 Pin (JEDEC MO-153 Var CD https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 22-27-2101, 10 Pins per row (http://suddendocs.samtec.com/prints/lshm-1xx-xx.x-x-dv-a-x-x-tr-footprint.pdf), generated with kicad-footprint-generator JST XA horizontal hook JST XA series connector, 53780-0970 (), generated with kicad-footprint-generator Molex Pico-Clasp series connector, B11B-EH-A (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LQFN, 16 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ri_soic_ic/ri_16_1.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-119-02-xxx-DV-BE-LC, 19 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 StandardBox.py) (https://product.tdk.com/info/en/document/catalog/smd/inductor_commercial_power_slf7032_en.pdf Inductor, TDK, MLZ2012_h0.85mm, 2.0x1.25x0.85mm, "https://product.tdk.com/system/files/dam/doc/product/inductor/inductor/smd/catalog/inductor_commercial_decoupling_mlz2012_en.pdf" Inductor, TDK, SLF10145, 10.1mmx10.1mm (Script generated with kicad-footprint-generator Harting har-flexicon series connector, SM16B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 26-60-4060, 6 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 JST PH series connector, BM15B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator LED SMD 1206 https://ww2.minicircuits.com/case_style/FV1206-7.pdf SMD Type 10.7MHz Ceramic Filter https://www.murata.com/en-us/products/filter/cerafil/sfecf 6-pin 3.8 x 3.8mm SAW filter package, https://www.golledge.com/media/3785/mp08167.pdf 8-pin 3.8x3.8mm.

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