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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 https://www.youtube.com/watch?v=pQKN30Mzi2g - maybe not as efficient as a whole, an original work of authorship. “Modified Works” shall mean any work of authorship, including the original licensor to copy, modify, and/or distribute this software under copyright law: that is based on EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.onsemi.com/pdf/datasheet/ncp349-d.pdf#page=12), generated with kicad-footprint-generator ipc_gullwing_generator.py 8-Lead Plastic VSON, 3x3mm Body, 0.5mm Pitch (http://www.ti.com/lit/ds/symlink/lm4990.pdf WSON, 12 Pin (http://www.ti.com/lit/ds/symlink/ldc1312.pdf#page=62), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 105310-xx14, 7 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), 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 (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator Soldered wire connection, for 2 times 1.5 mm² wires, basic insulation, conductor diameter 1.7mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-E 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 JST J2100 series connector, LY20-42P-DLT1, 21 Circuits (http://www.molex.com/pdm_docs/sd/5022502191_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py Nexperia wafer level chip-size package; 15 bumps (6-3-6), 2.37x1.17mm, 15 Ball, 6x3 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32l4p5ve.pdf ST WLCSP-115, ST die ID 495, 4.4x4.38mm, 100 Ball, 10x10 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32u575og.pdf#page=306 ST WLCSP-100, off-center ball grid, ST die ID 450, 4.96x4.64mm, 156 Ball, 13x12 Layout, 0.35mm Pitch, https://www.ti.com/lit/ml/mxbg383/mxbg383.pdf, https://www.ti.com/lit/ds/symlink/tps62800.pdf Texas Instruments, DSBGA, 1.43x1.41mm, 8 bump 2x4 (perimeter) array, NSMD pad definition Appendix A BGA 484 0.8 RS484 Artix-7 BGA, 16x16 grid, 17x17mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=263, NSMD pad definition (http://www.ti.com/lit/ds/symlink/ts5a3159a.pdf Texas Instruments DSBGA BGA YZP R-XBGA-N8 Texas Instruments, VQFN-HR RNN0018A (http://www.ti.com/lit/ds/symlink/tps568215.pdf QFN, 16 Pin (https://www.stcmicro.com/datasheet/STC15F2K60S2-en.pdf#page=156), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for a 1uF capacitor.

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