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An 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 Fireball/Fireball.kicad_pro | 6 Kosmo_panel | 1 | SW_SPDT | Switch, single pole normally-open illuminated tactile switch with LED, generic K switch normally-open pushbutton push-button LCD illuminated right angle DPDT push button (https://www.alps.com/prod/info/E/PDF/Tact/SurfaceMount/SKRT/SKRT.pdf push horizontal SPST 1P1T straight NO SMTR C&K E-Switch sub miniature slide switch, EG series, DPDT, right angle, http://www.ckswitches.com/media/1422/js.pdf CuK miniature slide switch, EG series, DPDT, right angle, PTS645VL31-2 LFS tactile switch SPST right angle, PTS645VL39-2 LFS tactile switch 6mm ALPS SKHH right angle 3mm spherical light pipe 1 way 3mm PLCC-2 PLCC-4 ambient light sensor Fiber Optic Transmitter and Receiver ambient light sensor chipled Broadcom DFN, 6 Pin (https://www.jedec.org/sites/default/files/docs/MO-193D.pdf variant BA), generated with kicad-footprint-generator ipc_gullwing_generator.py SO, 14 Pin (JEDEC MO-153 Var BC https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Mounting Hardware, external M3, height 15, Wuerth electronics 9774050960 (https://katalog.we-online.de/em/datasheet/9774050960.pdf,), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 48 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_48_05-08-1704.pdf), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MSTBV_2,5/6-GF; number of pins: 15; pin pitch: 5.00mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST.

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