Electrical Communication - Voltage Amplification and Power Amplification

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Voltage Amplification and Power Amplification Some amplifiers are designed primarily to increase voltage and are called voltage amplifiers. Other amplifiers are designed primarily to furnish power to devices such as loudspeakers and radio antennas and are called power amplifiers. A voltage amplifier often increases the feeble signal voltage generated by some device, such as a microphone, until this voltage is large enough to control the output of a power amplifier, which in turn drives a loudspeaker. Voltage amplifiers use voltage amplifying tubes which are small and usually have low direct voltages of several hundred volts or less, on the electrodes. Power amplifiers, however, use power output tubes which may be large and may have voltages of thousands of volts on the electrodes. The so-called beam-power tube¹⁵is used extensively as a power amplifier. No suppressor grid is used in this tube, -but, by a special arrangement and because of the shape of the electrodes, the undesired effects of secondary emission are eliminated, and the tube has the characteristics of a pentode.
Home Electronic Applications in Communication Voltage Amplification and Power Amplification

Last Update: 2011-05-30