A digital clock is a type of timepiece that displays time digitally. Even though people associate the digital clocks with electric drives, the digital description refers to only the display, and not to their driving mechanism. These clocks usually use 50 or 65-hertz oscillation of AC power for running. But, know that any clock needs an oscillator to work. In the digital clock, this is usually a crystal glass. As an electronic charge passes through this, which slightly changes its shape and makes a very light sound. This sound herd at regular frequency converts into an electric signal. Typically, the first counter counts one for each set of ten oscillations, and the other one counts one for each six “tens” oscillations.