Crystal oscillators are loosely divided because of the frequency they get the job done at and whether or not they are essential oscillators—work at the frequency marked to the can or at even multiples of that (overtone oscillators). As you can see within the graph under, crystals have two resonant https://tetrabookmarks.com/story18982208/how-much-you-need-to-expect-you-ll-pay-for-a-good-bulk-crystal-oscillator