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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 How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Figure 2 shows the RMS width for a typical detector, as seen at the preamplifier output. A preamplifier control pod, which features separate main volume and subwoofer level controls, a headphone jack and the miniplug input, is located on one of the satellite units. This adaptability allows for the use of additional digital sound processing for home theater audio signals via a separate receiver or surround sound preamplifier. |
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