Electromagnetic Clock
The configuration of this device is comparatively very simple and reliable. The typical deviation of the electromechanical clock is about 10 seconds per hour and it usually can run for about a year using the energy of the single battery. The electrical current powers either a pendulum or an electromechanical oscillator.
The electromechanical oscillator component has an attached magnet that passes two inductors. When the magnet passes the first inductor or sensor, the simple amplifier causes the current through the second inductor, and the second inductor works as an electromagnet, providing an energy pulse to the moving oscillator. This oscillator is responsible for the accuracy of the clock. The electronic part would not generate electrical pulses if the oscillator was absent or did not move. The resonant frequency of the mechanical oscillator should be several times per second.
Read more about this topic: Electric Clock
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