In Chapter 17, we learned how to use RC (resistor-capacitor) circuits to create timers. In this chapter, we are going to use our concept of timing circuits to move from one-time timer circuits to oscillating circuits.
For most of our uses of the NE555, you can actually leave pin 5 unconnected—our usage of the chip is not so precise or power-hungry as to be affected in this way. Nonetheless, I show it connected so that you can see how it is
supposed to be connected.
