Science Fair Project Encyclopedia
Preamplifier
(Redirected from Pre amplifier)
A preamplifier (preamp), as its name suggests, is an amplifier which precedes another amplifier.
The second amplifier is typically a power amplifier (power amp). In this example, the job of the preamp is to amplify a low level signal, perhaps from a microphone or pickup, to line level and to apply any necessary equalization and tone control .
A preamplifier is an electronic amplifier designed to prepare an electrical signal for further amplification.
Preamplifiers may be:
- in a separate housing.
- incorporated into the housing or chasis of the amplifier they feed.
- mounted in other items of equipment, such as microphones and electric guitars.
Examples are:
- the integrated preamplifier in a foil electret microphone.
- the first stages of an instrument amplifier.
- an audio mixing desk.
- a masthead amplifier used with television receiver antenna or a satellite receiver dish.
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details