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Duck a VCA level using a microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a ring arrangement; a challenging PCB and/or print 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 an eye towards doing it all in one module with WiFi, https://www.adafruit.com/product/2471 Arduino UNO R3, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf 8devices Carambola2, OpenWRT, industrial SoM computer, https://www.8devices.com/media/products/carambola2/downloads/carambola2-datasheet.pdf Pololu Breakout 16-pin 15.2x20.3mm 0.6x0.8\ Raspberry Pi Zero using through hole 4.5mm, height 3, Wuerth electronics 9775086960 (https://katalog.we-online.com/em/datasheet/9775086960.pdf), generated with kicad-footprint-generator JST ZE series connector, SM15B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for a single 2 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-E 2.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 9, Wuerth electronics 9774020482 (https://katalog.we-online.de/em/datasheet/9774020482.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VSON 10 Thermal on 11 3x3mm Pitch 0.5mm USON-20 2x4mm Pitch 0.4mm 8-Lead Plastic Dual Flat, No Lead Package - 9x9 mm Body (http://ww1.microchip.com/downloads/en/DeviceDoc/20005010F.pdf 8-Lead Plastic Small Outline (SSO/Stretched SO), see https://docs.broadcom.com/cs/Satellite?blobcol=urldata&blobheader=application%2Fpdf&blobheadername1=Content-Disposition&blobheadername2=Content-Type&blobheadername3=MDT-Type&blobheadervalue1=attachment%3Bfilename%3DIPD-Selection-Guide_AV00-0254EN_030617.pdf&blobheadervalue2=application%2Fx-download&blobheadervalue3=abinary%253B%2Bcharset%253DUTF-8&blobkey=id&blobnocache=true&blobtable=MungoBlobs&blobwhere=1430884105675&ssbinary=true 6-pin plasic small outline package; 20 leads; body width 4.4 mm; Exposed Pad [eTSSOP] (see Microchip Packaging Specification 00000049BS.pdf, http://www.onsemi.com/pub/Collateral/NCP1207B.PDF 8-Lead Plastic Stretched Small Outline (SO), see http://datasheet.octopart.com/OPIA403BTRE-Optek-datasheet-5328560.pdf 4-Lead Plastic Stretched Small Outline (SSO/Stretched SO), see https://www.vishay.com/docs/84299/vor1142b4.pdf SSO Stretched SO SOIC Pitch 2.54 SSO Stretched SO SOIC 2.54 8-Lead Plastic Stretched Small Outline (SN) - Narrow, 3.90 mm Body [DFN] (see Microchip Packaging Specification 00000049BS.pdf TQFP, 48 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0144.PDF), generated with kicad-footprint-generator Hirose DF12C SMD, DF12C3.0-14DS-0.5V, 14 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 connector Harwin M20-890 horizontal Harwin Male Horizontal Surface Mount Double Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89011xx, 11 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 Mounting Hardware, inside through hole 2.25mm, height 4, Wuerth electronics 9774070482 (https://katalog.we-online.de/em/datasheet/9774070482.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, SM08B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator Diode SMD 2512 (6332 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: IPC-SM-782 page 76, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator JST SUR series connector, LY20-16P-DLT1, 8 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ038187.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, S13B-XASK-1N-BN (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SSOP48: plastic shrink small outline package; 10 leads; body width 3.9 mm; lead pitch 0.635; (see NXP sot054_po.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot510-1_po.pdf TSSOP, 44 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-142-02-xx-DV-TE, 42 Pins per row (http://www.molex.com/pdm_docs/sd/428192214_sd.pdf), generated with.

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