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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 | 47k | Resistor | | J4 | 1 | TL071 | Operational amplifier, DIP-8 | | | D 2 rotary switch - 9.5mm, +5mm extra space - micro toggle switch ON-ON SPDT miniature toggle switch | | | | | J7 | 1 | LED | Light emitting diode, 5 mm Small Signal NPN Transistor, TO-92 Audio Jack, 2 Poles (Mono / TS) | | | | D3, D4, D5, D8, D9, D10 100V 0.15A standard switching diode, DO-35 Switch, triple pole double throw D Switch, single pole double throw, separate symbols | | Tayda | A-1135 | | | | | | Tayda | A-157 | | Tayda | A-804 | | Tayda | A-1121 | | Screws, nuts, and spacers (see [build notes](build.md)) | | J1 | 1 | LED | Light emitting diode, 5 mm x 20 mm fuse holders; Vertical w/o Stability Pins; 250V; 6.3-16A (http://www.cooperindustries.com/content/dam/public/bussmann/Electronics/Resources/product-datasheets/Bus_Elx_DS_2118_HB_PCB_Series.pdf 5 mm x 20 mm, Slotted Cap/Fingergrip, vertical, IEC 60335-1; 250VAC/10A VDE; 500V/16A UL/CSA (https://us.schurter.com/bundles/snceschurter/epim/_ProdPool_/newDS/en/typ_FPG4.pdf Shock-Safe closed Fuseholder, Schurter FUP Series, 5.0 x 20mm, Slotted Cap, horizontal, 500 VAC 4W/16A (VDE), 600V 30A (UL/CSA), order numbers: 0031.2510 (0031.2500 + 0031.2323), http://www.schurter.ch/bundles/snceschurter/epim/_ProdPool_/newDS/en/typ_FUP.pdf Fuseholder 5x20mm closed horizontal Bulgin FX0457 Sicherungshalter PCB fuse holders for 5 times 0.127 mm² wires, reinforced insulation, conductor diameter 2.4mm, outer diameter 3.5mm, size source Multi-Contact FLEXI-xV 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: A-41792-0007 example for new part number: A-41791-0009 example for new mpn: 39-29-4129, 6 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator Tantalum Capacitor SMD 0402 (1005 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-130-02-xx-DV-TE, 30 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_gullwing_generator.py SOIC, 28 Pin (http://www.st.com/resource/en/datasheet/stm32f031k6.pdf#page=90), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 32 Pin (https://www.ti.com/lit/ds/symlink/bq25703a.pdf#page=90), generated with kicad-footprint-generator Hirose DF12E SMD, DF12E3.0-40DP-0.5V, 40 Pins (https://www.molex.com/pdm_docs/sd/537480308_sd.pdf), generated with kicad-footprint-generator JST VH series connector, LY20-30P-DT1, 15 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-108-02-xxx-DV-A, 8 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.

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