• on Education & Information
  • Published in issue 10/2010 on page 72
About the article

From Microphone to Line Input

Design Tip

The requirements a microphone pre-amplifier is expected to meet are very different from those formulated for a line amplifier. For the first, a large gain and a low noise contribution are very important, while a line amplifier has to be able to handle a much larger signal without generating distortion. A microphone input has a sensitivity of a few millivolts; a line input must be able to cope with several volts.
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Extra info, Update

Correction

September 21, 2010.

In Figure 3, the junction of R1 and Rp should not be connected to ground.

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