Books

  • The Art of Electronics - Paul Horowitz, Winfield Hill
    The book for a hands-on approach to circuit technology, almost no maths, pure fun.

Websites

  • sound-au.com by Rod Elliot Huge list of audio-related projects, with the theory of operation.

  • elektronik-kompendium.de by Patrick Schnabel
    German page with great articles on the NE555 and much more.

  • MicroModeler
    A very good free DSP model synthesizer and code generator for discrete filters.

Youtube Channels

  • EEVblog by Dave Jones
  • Phil’s Lab by Philip Salmony

Free Software

  • Scilab by ESI Group
    An open-source version of Matlab/Simulink.

  • Micro Cap 12 by Spectrum Software
    A comprehensive circuit simulator that is now free since the developer closed down.

  • LT Spice by Analog Devices
    Analog Devices’ (used to be Linear Technology) SPICE-based simulator. There are many similar tools from different manufacturers, models are not interchangeable.

  • Saturn PCB Design Toolkit by Saturn PCB
    A handy calculator for PCB design.

  • KiCad by some legends at CERN
    A capable ECAD program for schematic capture, PCB layout and Gerber generation with an integrated 3D renderer.