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Top: A sender and receiver are communicating over simple request and acknowledge lines. The sender drives the request line, and the receiver drives the acknowledge line. Middle: Timing diagram of two, two-phase communications. From the beginning, the sender initiates the first communication by raising the request line.
A simplified diagram of a two-phase alternator [1] Two-phase electrical power was an early 20th-century polyphase alternating current electric power distribution system. Two circuits were used, with voltage phases differing by one-quarter of a cycle, 90°. Usually circuits used four wires, two for each phase.
One voltage cycle of a three-phase system. A polyphase system (the term coined by Silvanus Thompson) is a means of distributing alternating-current (AC) electrical power that utilizes more than one AC phase, which refers to the phase offset value (in degrees) between AC in multiple conducting wires; phases may also refer to the corresponding terminals and conductors, as in color codes.
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2 dual 4-bit D-type flip-flop, synchronous clear, non-inverting outputs three-state 24 SN74ALS878: 74x879 2 dual 4-bit D-type flip-flop, synchronous clear, inverting outputs three-state 24 SN74ALS879: 74x880 2 dual 4-bit transparent latch with clear, inverting outputs three-state 24 SN74ALS880: 74x881 1 4-bit arithmetic logic unit 24 SN74AS881A ...
If two electrical networks operating at two different phase angles were to be connected to each other, a fault similar to a short circuit would occur, presenting a hazard of damage to the generator or other equipment. The position (as opposed to rotation) of the pointer on a synchroscope indicates the phase angle between the two systems.
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