A quartz bell could be made, but it is not the best shape because replica watches uk too much energy is coupled to the air. The best shapes are a straight bar or a disk. A bar has the advantage of keeping the same rolex replica frequency provided the ratio of length to width remains the same. A quartz bar can be tiny and oscillate at a relatively low frequency -- 32 kilohertz (KHz) is usually chosen for omega replica watches not only for size, but also because the circuits that divide down from the crystal frequency to the few pulses per second for the display need more power for higher frequencies cartier replica. Power was a big problem for early watches, and the Swiss spent millions trying to bring forward integrated-circuit technology to divide down from the 1 to 2 MHz the more stable disk crystals generate. Modern quartz watches now use a low-frequency bar or rolex replica tuning-fork-shaped crystal. Often, these crystals are made from thin sheets of quartz plated like an integrated circuit and etched chemically to shape. The major difference between omega replica good and indifferent time keeping is the initial frequency accuracy and the precision of the angle of cut of the quartz louis vuitton replica sheet with respect to the crystalline axis. The amount of contamination that is allowed to get through the encapsulation louis vuitton replica to the crystal surface inside the watch can also affect the accuracy. The electronics of the watch initially amplifies noise at the replica handbags crystal frequency. This builds or regenerates into oscillation -- it starts the crystal ringing. The replica watches uk output of the watch crystal oscillator is then converted to pulses suitable for the digital circuits. These divide the crystal's frequency down and then translate it into the proper replica watches format for the display. (See How Digital Clocks Work for a detailed discussion of dividers and replica watches display drivers.) Or, in a quartz watch with hands, the dividers create one-second pulses that drive a tiny electric motor, and this louis vuitton replica motor is connected to standard gears to drive the hands.