With TTL NAND gates and a small number of components can form an acousto-optic metronome , which is easy to start, easy to adjust, sound and light can alternately appear, the figure shows the line of the acousto-optic metronome. The illustrated line beat frequency is 5~300 beats/min. It consists of three parts: ring oscillator, photoelectric switch and audio oscillator. The ring oscillator consists of the NOT gates F1 and F2. If the potential at point A goes from high "1" to low "0", the potential at point B becomes "1"; the potential at point C changes from "1" to "0", because the voltage on both sides of capacitor C1 cannot be abrupt, so point D The potential is equal to the high voltage "1" at point B, and the potential at point M is changed from "1" to "0".
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Transmission And Distribution Pole
Steel poles are commonly used to carry several types of electric power lines, distribution lines and lighting system. Distribution lines carry power from local substations to customers. They generally carry voltages from 4.6 to 33kV for distances up to 30 miles, and include transformers to step the voltage down from the primary voltage to the lower secondary voltage used by the customer. A service drop carries this lower voltage to the customer's premises.
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