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Transients The ac that appears at utility outlets is a sine wave with a constant voltage near 117 V rms or 234 V rms. But there are often voltage spikes, known as transients, that can attain positive or negative peak values of several thousand volts. Transients are caused by sudden changes in the load in a utility circuit. A thundershower can produce transients throughout an entire town. Unless they are suppressed, transients can destroy the diodes in a power supply. Transients can also cause problems with sensitive electronic equipment such as computers or microcomputer-controlled appliances. The simplest way to get rid of common transients is to place a small capacitor of about 0.01 F, rated for 600 V or more, between each side of the transformer primary and electrical ground, as shown in Fig. 21-11. A good component for this purpose is a disk ceramic capacitor (not an electrolytic capacitor). Disk ceramic capacitors have no polarity issues. They can be connected in either direction to work equally well. Commercially made transient suppressors are available. These devices, often mistakenly called surge protectors, use sophisticated methods to prevent sudden voltage spikes from reaching levels where they can cause problems. It is a good idea to use transient suppressors with all sensitive electronic devices, including computers, hi-fi stereo systems, and television sets. In the event of a thundershower, the best way to protect such equipment is to physically unplug it from the wall outlets until the event has passed.

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One notable feature of IPng is that it will have 128-bit addresses; predictions are that IP s current 32-bit address space will be exhausted by 1998 Because of growing interest in the Web, access technologies are hot and everybody wants more bandwidth over the local loop Most modem technologies in use operate at a whopping 144 Kbps, but 288 Kbps modems are on the market and work is underway to achieve 336 ISDN continues to wallow in uncertainty, plagued by spotty availability, conflicting implementation standards, and questions about its value The corporate world is undergoing its own evolution at this time Microsoft, Cisco, and other corporations are at the elbow of their corporate development curve There are seven RBOCs The only significant competitive players, other than the independents, are Teleport and MFS SONET standards are still considered somewhat immature; OC-48 is a laughable dream.

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When current passes through a diode, half of the cycle is cut off, as shown in Fig. 20-1. This occurs no matter what the frequency, from 60-Hz utility current through RF, as long as the diode capacitance is not too great. The output wave from the diode looks much different than the input wave. This condition is known as nonlinearity. Whenever there is nonlinearity of any kind in a circuit that is, whenever the output waveform is shaped differently from the input waveform there will be harmonic frequencies in the output. These are waves at integer multiples of the input frequency. (If you ve forgotten what harmonics are, refer back to chapter 9.) Often, nonlinearity is undesirable. Then engineers strive to make the circuit linear, so that the output waveform has exactly the same shape as the input waveform. But sometimes a circuit is needed that will produce harmonics. Then nonlinearity is introduced deliberately. Diodes are ideal for this. A simple frequency-multiplier circuit is shown in Fig. 20-3. The output LC circuit is tuned to the desired nth harmonic frequency, nfo, rather than to the input or fundamental frequency, fo.

21-10 Diodes in parallel,

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For a diode to work as a frequency multiplier, it must be of a type that would also work well as a detector at the same frequencies. This means that the component should act like a rectifier, but not like a capacitor.

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Fuses A fuse is a piece of soft wire that melts, breaking a circuit if the current exceeds a certain level A fuse is placed in series with the transformer primary, as shown in Fig 21-11 A short circuit or overload anywhere in the power supply, or in equipment connected to it, will burn the fuse out If a fuse blows out, it must be replaced with another of the same rating Fuses are rated in amperes (A) Thus, a 5-A fuse will carry up to 5 A before blowing out, and a 20-A fuse will carry up to 20 A Fuses are available in two types: the quick-break fuse and the slow-blow fuse A quick-break fuse is a straight length of wire or a metal strip A slow-blow fuse usually has a spring inside along with the wire or strip.

When two waves having different frequencies are combined in a nonlinear circuit, new frequencies are produced. These new waves are at the sum and difference frequencies of the original waves. You ve probably noticed this mixing, also called heterodyning, if you ve ever heard two loud, sine wave tones at the same time. Suppose there are two signals with frequencies fl and f2. For mathematical convenience, assign f2 to the wave with the higher frequency. If these signals are combined in a nonlinear circuit, new waves will result. One of them will have a frequency f2 fl, and the other will be at f2 + f1. These are known as beat frequencies. The signals are called mixing products (Fig. 20-4).

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Výpadky UPC – internet, televize, telefon | upc.cz
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25 településen szembesülhettek leállással a UPC ügyfelei. ... 25 város érintett. Pénzcentrum; 2018 . március 27. kedd 15:25. Hiába hívod az ügyfélszolgálatot.

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