Components. Components ; Resist if you must ; More components and semiconductors ; Two projects and them some more -- Introduction to digital electronics. Digital logic ; The first NAND gate circuit ; Analog switches for digital circuits ; The NAND gate oscillator ; How do we understand what we can't see? ; Digital logic project -- Counting systems in electronics. Introducing an analog-to-digital converter ; The 4015 walking ring counter ; Running a seven-segment display ; Define, design, and make your own project -- Amplifiers : what they are and how to use them. What is an amplifier? ; Exploring the op amp ; Applying the op amp : building the intercom ; Prototype and design : patience has its rewards -- Appendices. Common component packaging ; Capacitors : reading and decoding ; Animations list ; Glossary ; Make your own printed circuit boards.