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preamplifier |
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preamplifier [prē′am·plə‚fī·ər]
(electronics) An amplifier whose primary function is boosting the output of a low-level audio-frequency, radio-frequency, or microwave source to an intermediate level so that the signal may be further processed without appreciable degradation of the signal-to-noise ratio of the system. Also known as preliminary amplifier. Preamplifier A voltage amplifier suitable for operation with a low-level input signal. It is intended to be connected to another amplifier with a higher input level. Preamplifiers are necessary when an audio amplifier is to be used with low-output transducers such as magnetic phonograph pickups. A preamplifier may incorporate frequency-correcting networks to compensate for the frequency characteristics of a given input transducer and to make the frequency response of the preamplifier-amplifier combination uniform. See Amplifier, Voltage amplifier Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | The compact system has laptop capability and features remote control and an impedance display on the preamplifier, allowing the tester to move away from the computer and be in close contact with the patient. To gain full advantage of a small microphone, a preamplifier of the same diameter as the microphone is desired for free-field measurements. There are many lesser-known components available that are vital to creating a high-end home theater environment Some of these components include sound equipment like a home theater amplifier or a surround sound preamplifier There are many lesser-known components available that are vital to creating a high-end home theater environment. |
preamplifier |
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