We’ve read a lot about oscillators, but crystal oscillators seem to be a bit of a mystery. Hobby-level books tend to say, build a circuit like this and then mess with it until it oscillates.

The two persons above are the geniuses who gave us two classic oscillator circuits as shown in Figure 1. Figure 1 The two classic oscillators circuits: Colpitts (left) and Clapp (right). However, a ...