Re: microphone preamp

On 2007-01-15, alexxx.magni@xxxxxxxxx <alexxx.magni@xxxxxxxxx> wrote:
Hello,
I need to record sound coming from a large space (a room) with a
microphone connected to a PC soundcard. So far the results have been
disappointing, and I've been suggested that I need to preamp the
microphone.
Can you kindly suggest a <VERY SIMPLE> circuit design (I'm a begginer)?
I don't need anything complicated, since I can sustain without problem
reasonable amounts of noise and distortion.

I found this helped with a 600 ohm microphone.

tip ---------+-[4m7]-.
| |
\ |
0.1uF \| | || 2.2uF
|----+-||--------.
|/| || \_ |
/~ BC547 ( )|
| /~ |
sleeve ------+-------------------'

advantages
1 simple
2 draws power from the soundcard

disadvantages
1 performance varies from mediocre to bad
  depending on parts and temperature

try differemt resistors 3.3M 3.9M 5.6M etc

.-------------------------------------------------------------.
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`-------------------------------------------------------------'



--

Bye.
Jasen
.

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