Is it possible to amplify electricity

The signals are transmitted using antennas and the range of transmission depends on the magnitude of power of signals fed to the antenna. For wireless transmissions like FM broadcasting, antennas require input signals at thousands of kilowatts of power. Here, Radio Frequency Power amplifiers are employed to increase the magnitude of power of modulated waves to a level high enough for reaching the required transmission distance.

They are used in electronic control systems which need high power signals to drive motors or actuators. They take input from microcontroller systems, increase its power and feed the amplified signal to DC motors or Actuators. There are multiple ways of designing a power amplifier circuit. The operation and output characteristics of each of the circuit configurations differs from one another.

To differentiate the characteristics and behavior of different power amplifier circuits, Power Amplifier Classes are used in which, letter symbols are assigned to identify the method of operation. They are broadly classified into two categories. The most commonly used power amplifiers are the ones used in audio amplifier circuits and they come under classes A, B, AB or C. Analog waveforms are made up of positive highs and negative lows.

In this class of amplifiers, the entire input waveform is used in the amplification process. A single transistor is used to amplify both the positive and negative halves of the waveform.

This makes their design simple and makes class A amplifiers the most commonly used type of power amplifiers. Although this class of power amplifiers are superseded by better designs, they are still popular among hobbyists.

In this class of amplifiers, the active element the electronic component used for amplifying, which is transistor in this case is in use all the time even if there is no input signal. So, the signal distortion levels are very less allowing better high frequency performance. Class B power amplifiers are designed to reduce the efficiency and heating problems present in the class A amplifiers.

Instead of a single transistor to amplify the entire waveform, this class of amplifiers use two complementary transistors. One transistor amplifies the positive half of the waveform and the other amplifies the negative half of the waveform.

The efficiency of class B amplifiers is improved a lot over class A amplifiers because of two transistor design. Power amplifiers of this class are used in battery operated devices like FM radios and transistor radios.

Because of superposition of two halves of the waveform, there exists a small distortion at the crossover region. To reduce this signal distortion, class AB amplifiers are designed. And, by placing resistor RL in series with the collector, voltage amplification can be gained.

In this condition if we place a transistor in the circuit, which has a gain of , the signal will be boosted. This current will now be sufficient to light our LED in the circuit. Pages Blog. Child pages. Applied Physics for Information Technology. Browse pages. A t tachments 0 Page History. Jira links. Created by Unknown User sujanp , last modified on Transistor amplifying current Transistors are normally used as amplifiers. Considering the above diagram: The small current travels from the voltage source into the base of the transistor.

No labels. Powered by Atlassian Confluence 6. One way to amplify a signal is to use an operational amplifier op-amp with two resistors connected to form an amplifying feedback circuit, as shown in Figure For this kind of circuit, the gain is given by the formula.

The circuit in Figure 37 is made using the Multisim Live simulation package. The three circular objects on the left are here used to generate a signal.

V1 generates a voltage sine wave with amplitude 0. V2 generates a voltage sine wave with amplitude 0. V3 generates a voltage sine wave with amplitude 0. Together, they generate the very weak signal shown in Figure Rearranging the equation for cap g in terms of cap r sub two gives.

Op-amps are able to amplify signals many thousands of times. Here the amplification is by a gain factor of 10 so that the signal and the amplified signal can both be seen on the same scale. Some signals from sensors are much weaker and may require a gain in the order of hundreds or even thousands. This concludes your lightning visit to the world of electronic signals and filtering. As well as investigating the theoretical properties of signals, you have seen how they can be amplified using op-amps.

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