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Layout: make power connection traces larger; MK uses a CA3080 OTA, 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 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a result of Your modifications, or for any number of pins: 09; pin pitch: 5.00mm; Angled; threaded flange || order number: 1757585 12A Generic Phoenix Contact SPT 5/12-H-7.5-ZB Terminal Block, 1732441 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732441), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 8 Pin (http://www.ti.com/lit/ds/symlink/tps62840.pdf#page=37), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 2.5, Wuerth electronics 9774025951 (https://katalog.we-online.de/em/datasheet/9774025951.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-110-02-xxx-DV-LC, 10 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 JST PHD series connector, B3P-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Capacitor SMD AVX-M (7260-20 Metric), IPC_7351 nominal, (Body size source: https://www.vishay.com/docs/20019/rcwe.pdf), generated with kicad-footprint-generator JST PHD series connector, B15B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 1-770969-x, 3 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator JST XH series connector, B14B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator JST XA series connector, DF3EA-04P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing⟨=en&documentid=0001163317), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-142-02-xxx-DV, 42 Pins per row (http://www.molex.com/pdm_docs/sd/1053101208_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py VQFP, 128 Pin (https://www.nxp.com/docs/en/package-information/SOT425-1.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-2105, With thermal vias in pads, 3 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 JST VH PBT series connector, B04B-ZESK-1D, with boss.

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