www.newtoncbraga.com.br/index.php/livros-tecnicos (Books and Magazines Newton C. Braga available Free on your website, and many electronic circuits)

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www.electronica-pt.com/esquema (Electrical schemes of monitors, TV, Nobreaks, diverse circuits and others)

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amormaior.org/ (Free books of great knowledge in favor of humanity)

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www.learningaboutelectronics.com/CalculadorasPortugues (Site of various calculators for electronics and physics, filters, voltage, resistances, etc.)

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www.epanorama.net (Site in English with several circuits, electrical diagrams and information)

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www.qsl.net/in3otd/parallr.html (Site to calculate series and parallel resistances, inductances, resonance frequency, etc.)

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coil32.net/online-calculators/ferrite-torroid-calculator.html (Site to easily calculate inductors with ferrite toroid core)

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energylabs.com.br/el/secao/calculadora (Capacitive and inductive reactance calculator website and others)

 

www.gerber-viewer.com (Site to open and view GERBER files)

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www.memtest.org/#downiso (Software to generate bootable Pendrive computer RAM tester)

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www.diymodules.org (Free library site for Eagle PCB Library)

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www.youtube.com/watch?v=KszGV_UfBXw (Interesting video to test your hearing)

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pk2lab.blogspot.com/2012/06/conversor-digital-analogico-r2r.html (Site teaching how to generate a sinusoidal signal with digital circuit and R2R)

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www.corpusiuris.org (Site unmasking mass ideologies in humanity)

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www.youtube.com/watch?v=xJGn0rA_Oik (Video how to remove copper from a PCI)

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