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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 | | S1 | 1 | Conn_01x10 | Pin header, 2.54 mm, 1x10 | | R30 | 1 | B20k | Potentiometer | | | U3 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x10 | | | | | | | | | | | | | | C6, C7, C8, C9 | 4 | | J6, J10, J11 | 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 female-on-board top-entry thru-hole 8 pin package (http://datasheet.octopart.com/ZDT6758TA-Zetex-datasheet-68057.pdf Diodes Incorporated PowerDI3333-8, Plastic Dual Flat, No Lead Package (MD) - 4x4x0.9 mm Body [DFN-S] (see Microchip Packaging Specification 00000049BS.pdf 44-Lead Plastic Quad Flat, No Lead Package - 6x8x0.9mm Body (https://www.microsemi.com/document-portal/doc_download/131677-pd70224-data-sheet Mini Circuits Case style FG (https://ww2.minicircuits.com/case_style/FG873.pdf LQFN, 48 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-ssop/05081887_A_G48.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HSOP, 8 Pin (https://www.winsen-sensor.com/d/files/me2/mems--gm-402b--manual-v1_1.pdf Omnidirectional, -42dB, reflowable, electret condenser microphone https://www.cuidevices.com/product/resource/cmc-4013-smt-tr.pdf Infineon_PG-LLGA-5-1 StepUp generated footprint, http://katalog.we-online.de/pbs/datasheet/7440310047.pdf wurth wuerth smd inductor Current-Compensated Ring Core Double Chokes, EPCOS, B82722A, 22.3mmx22.7mm, https://en.tdk.eu/inf/30/db/ind_2008/b82722a_j.pdf Current-compensated Chokes, Schaffner, RN218-04, 12.5mmx18.0mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN204-04, 9.0mmx14.0mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN112-04, 17.7mmx17.1mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN143-04, 33.1mmx32.5mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN122-04, 28.0mmx27.0mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN202-04, 8.8mmx18.2mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN122-04, 28.0mmx27.0mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN216-04, 15.5mmx23.0mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN216-04, 15.5mmx23.0mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Current-compensated Chokes, Schaffner, RN242-04, 18.0mmx31.0mm https://www.schaffner.com/products/download/product/datasheet/rn-series-common-mode-chokes-new/ Inductor, Murata BL01RN1A2A2, Axial, Horizontal, pin pitch=15.24mm, , length*diameter=14*4.5mm^2, Fastron, LACC, http://www.fastrongroup.com/image-show/20/LACC.pdf?type=Complete-DataSheet&productType=series Inductor Axial series Axial Horizontal pin pitch 21.80mm length 46mm width 19.1mm Vishay TJ7 L_Toroid, Horizontal series, Radial, pin pitch=3.50mm, diameter=8mm, height=11.5mm, Non-Polar Electrolytic Capacitor C, Rect series, Radial, pin pitch=10.00mm, diameter=30mm, height=45mm, Electrolytic Capacitor, , http://www.vishay.com/docs/28342/058059pll-si.pdf CP Radial series Radial pin pitch 2.50mm diameter 6.0mm Inductor, Radial series, Radial, pin pitch=22.50mm, , length*width=24*12.6mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 10.00mm length 11.0mm width 8.8mm Capacitor C, Rect series, Radial, pin pitch=5.00mm, , length*width=8*8mm^2, Neosid, SD8, http://www.neosid.de/produktblaetter/neosid_Festinduktivitaet_Sd8.pdf Inductor Radial series Radial pin pitch 2.54mm size 10.6x6.2mm^2 drill 1.1mm pad 2.2mm Terminal Block WAGO 236-409 45Degree pitch 5mm size 45x10mm^2 drill 1.3mm pad 2.6mm Terminal Block Phoenix MKDS-1,5-15 pitch.

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