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Q: How many output power class does bluetooth have?
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Total power output (Total RMS output): 1000 watts


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What the abbreviation 2500 2500 watts PMPO mean?

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For how many degrees of an input sine wave does a class B amplifier conduct?

The actual answer is 360 degrees, that is, a class B amplifier will conduct for the entire 360 degrees of an input sine wave. However, the interesting part is how this is accomplished. For a "pure" class B amplifier, each of the two output power devices will conduct for 180 degrees of the total 360 degrees of a complete sine wave. This is because in a class B amplifier, each of the output devices is biased so that it is off when the input signal is zero. When the input signal goes positive, one of the output devices will conduct. Assuming there is no overall phase inversion in the amplifier, this would be the "upper" device that is connected to the positive voltage rail. In a typical solid state audio power amplifier, this device is usually an NPN transistor or power MOSFET. The "lower" device, typically connected to the negative voltage rail, will conduct when the input signal goes negative. This device will typically be a PNP transistor in a solid state amplifier, or a power MOSFET. There are many possible configurations for class B amplifiers. For example, with vacuum tube amps, there is usually only a positive voltage supplied to the output stage, and the two output tubes are identical types. Instead of connecting the lower tube to a negative rail, it is usually connected to ground, but since we are interested in AC amplification, and also since an output transformer is required to couple tube output stages to low impedance loads such as loudspeakers, this doesn't present a problem. The output transformer will have a center tap where the positive output stage voltage is connected, and each of the output tubes will conduct in alternating fashion, similarly to the output of a solid state amp. In fact, early solid state audio amps also used output transformers, and they typically also used two NPN transistors for output devices, in contrast to modern designs that use symmetrical matched pairs of NPN/PNP. At that time it was difficult to obtain high power matched pairs, whereas high power NPNs were relatively easy to obtain. A variation that is often used to obtain more power is the doubling of output devices by operating them in parallel to obtain higher current gain. It is possible to see six, eight, or even more devices operating in this way, but it will almost always be in multiples of two. Nevertheless, no matter what the variations, a class B amplifier will always conduct for 360 degrees of an input sine wave. There is an important qualification on this, however. A true class B amplifier is almost never seen, due to a problem called "crossover distortion." This occurs because any output device has a nonlinear region during turn-on from zero conduction. While the input signal is beginning to go positive, for example, the output device will not "follow" the input signal in a proportional manner. To overcome the distortion caused by this, most audio amps are operated in class AB, where each of the output devices is biased slightly on all the time. This technique virtually eliminates crossover distortion.


How do you save energy with the use of computer?

There are many ways 1 Turn bluetooth off, bluetooth is the last button on the left on the white bar for apple macs 2 Turn airport off when you're not using the internet. Airport looks like curvy lines next to bluetooth. 3 Quit applications that you don't need right now, like comic life or sync. 4. Right click on your battery in the bottom right of the screen and go to "Power Options". From there, you can set your power mode to "Power Saver".


How do you make power supply variable?

A variable power supply is one whose output voltage (or current) can be adjusted and therefore set to a desired figure. They are used in development and design odf circuits, eliminating the need for possibly many power supplies of different output voltages. Once a circuit is connected to it, the output would not normally be changed.