Chapter 2. Switching
This chapter of the book contains Experiments 6 through 11, which explore the seemingly simple topic of switching—by which I mean not just manual control, but using one flow of electricity to switch, or control, another. It’s such an important principle, no digital device can exist without it.
Today, switching is mostly done with transistors. I will deal with them in detail, but before that I’ll back up and illustrate the concept by introducing you to relays, which are easier to understand, because you can see what’s going on inside them. And before I get to relays, I’ll show how manually activated switches can demonstrate some of the concepts that will follow. So, the sequence will be switches—relays—transistors.
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