Preamplifier Circuits

  

A preamplifier (preamp) circuit is an electronic amplifier that prepares a small electrical signal for further amplification. A preamplifier, or control amplifier, functions as a stage between an amplifier and a source component in an audio system, raising the level of the signal.

The noise performance of a preamplifier is critical according to Friis's formula, when the gain of the preamplifier is high, the SNR of the final signal is determined by the SNR of the input signal and the noise figure of the preamplifier. The preamplifier provides voltage gain from 10 millivolts to 1 volt but no significant current gain.

The power amplifier provides the higher current necessary to drive loudspeakers. Most moving coil preamplifiers can provide up to 62 dB of gain, while moving magnet designs provide up to 40 dB of gain. Microphone preamplifiers have XLR style inputs on them, and can be either tube or transistor-based designs. Microphone preamplifiers also have to be able to provide 48 volts of phantom power that is needed for many microphones to work.

 

 

News

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Steve Vai reveals Carvin Legacy Drive Preamp pedal | MusicRadar

MusicRadar Steve Vai reveals Carvin Legacy Drive Preamp pedal | MusicRadar MusicRadar Guitar legend Steve Vai recently set Carvin the challenge of cramming the tone of his signature Legacy amp in a format he could pack...

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THE NEW STEVE VAI CARVIN LEGACY DRIVE PREAMP PEDAL

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Gear Review: The Grace ALiX Preamp/EQ/DI Is a Robust, Stage-Ready Package

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Day: January 28, 2017

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Jan 28, 2017

Supro 1610RT Comet review

MusicRadar Supro 1610RT Comet review MusicRadar Now owned by New York-based Absara Audio of Pigtronix pedals fame, the new models are made with care and respect for Supro's extensive heritage, perfect for the...

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Universal Audio Apollo Twin MkII for Mac and Windows Systems

American Songwriter Universal Audio Apollo Twin MkII for Mac and Windows Systems American Songwriter ... which allows its dual mic preamps and front-panel DI to sound and behave like the world's most...

Jan 20, 2017

radio receiver | Hackaday

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Feb 1, 2017

Classe Audio Sigma SSP MkII Adds Support for 4K Video and 3D Audio

Classe Audio Sigma SSP MkII Adds Support for 4K Video and 3D Audio Home Theater Review Classe Audio has announced an updated version of its Sigma SSP AV preamp that adds support for 4K video pass-through and 3D...

Feb 12, 2017

Asus B150M Expedition motherboard goes official

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