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Sunday, 19 October 2008 |
By myarticlesub
 Combinational Circuit:
Logic circuits for digital systems may be combinational or sequential. A combinational circuit consists of logic gates whose outputs at any time are determined by combining the values of the applied inputs using logic operations. A combinational circuit performs an operation that can be specified logically by a set of Boolean expression. In addition to using logic gates, sequential circuits employ elements that store bit values. Sequential circuit outputs are a function of inputs and the bit value in storage elements. These values, in turn, are a function of previously applied inputs and stored values. As a consequence, the outputs of a sequential circuit depend not only on the presently applied values of the inputs, but also on pas inputs, and the behavior of the circuit must be specified by a sequence in time of inputs and internal stored bit values.
A combinational circuit consists of input variables, output variables, logic gates and interconnections. The interconnected logic gates accept signals from the inputs and generate signals at the output. The n input variables come from the environment of the circuit, and the m |
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Last Updated ( Sunday, 19 October 2008 )
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Saturday, 18 October 2008 |
By Daniel Millions
 Mechanical watches use mechanical movement to tick off the seconds of time. The measurement of time on a modern mechanical watch is done through a spring, which
activates the rest of the watch movement. The mechanical watch may lose up to an hour per year and the majority of mechanical watches have a winder to restart the watch, which for many watch enthusiasts is a nice mechanical touch.
The mechanical watch is not prone to stopping when it is around objects, which have a strong electrical field. The mechanical watch can be relied on under different conditions and will keep time as long as it is maintained and repaired as necessary. Most mechanical watches are created for durability since these watches will last for a long time.
The earliest recorded mechanical movement was developed in China by the mathematician monk, Yi Xing and a government official named Liang Lingzan. This early mechanical clock used water in its motion and would mark time as a sequence of one day and night passed.
The extraordinary Ottoman Taqu al-Din created the alarm |
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Last Updated ( Saturday, 18 October 2008 )
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