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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 schematic start, and some example modules Envelope/Envelope.kicad_pcb | 2 | 10k | Resistor | | | | | | | U1 | 1 | B20k | Potentiometer | | | L1 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x4 | | | Tayda | A-1605 | | 14 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 (https://www.diodes.com/assets/Package-Files/U-DFN2510-10-Type-CJ.pdf U-DFN2020-6 (Type F) (https://www.diodes.com/assets/Package-Files/U-DFN2020-6-Type-F.pdf HVQFN, 16 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/436412f.pdf#page=22), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 16 Pin (http://www.ti.com/lit/ds/symlink/ina3221.pdf#page=44), generated with kicad-footprint-generator JST PH series connector, DF52-11S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator JST PH series connector, S13B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator JST VH series connector, 505405-1370 (http://www.molex.com/pdm_docs/sd/5054050270_sd.pdf), generated with kicad-footprint-generator Hirose DF11 through hole, DF13-15P-1.25DSA, 15 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 ipc_noLead_generator.py QFN, 28 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=289), generated with kicad-footprint-generator ipc_noLead_generator.py WDFN, 6 pin, 4.0x2.6, 0.65P; Two exposed pads, (https://www.onsemi.com/pub/Collateral/511BZ.PDF DFN 0.65P dual flag WDFN-8 1EP 2.2X2.0 0.5P WDFN, 8 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/2451fg.pdf#page=17), generated with kicad-footprint-generator Harwin Female Vertical Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-7811245, 12 Pins per row (http://www.molex.com/pdm_docs/sd/439151404_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 7, Wuerth electronics 9774020633 (https://katalog.we-online.com/em/datasheet/9774020633.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, 53780-3070 (), generated with kicad-footprint-generator Molex CLIK-Mate series connector, BM02B-GHS-TBT (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 5566-04A2, example for new part number: 26-60-4120, 12 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 Phoenix Contact, SPT 5/5-H-7.5-ZB Terminal Block, 1719228 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719228), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 7, Wuerth electronics 9774100482 (https://katalog.we-online.de/em/datasheet/9774100482.pdf), generated with kicad-footprint-generator JST XH vertical boss JST ZE series connector, S7B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.3mm, height 11, Wuerth electronics 9774070982 (https://katalog.we-online.de/em/datasheet/9774070982.pdf), generated with kicad-footprint-generator Resistor SMD 2816 (7142 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: IPC-SM-782 page 72, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-142-02-xxx-DV-LC, 42 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 Molex Picoflex Ribbon-Cable Connectors, 90325-0014, 14 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 1.5.

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