Re: microphone preamp


jasen ha scritto:

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

.-------------------------------------------------------------.
| This is an ascii schematic, if the diagram appears garbled |
| try switching to a fixed-pitch font (courier works well) |
| pasting it into notepad works well on ms-windows. |
| in google groups selecting 'fixed font' (top right of page) |
| or view source (options) work too. |
`-------------------------------------------------------------'



--

Bye.
Jasen

Hi Jasen - thanks for your help!
One problem only, I'm slightly confused on the diagram (even reading
it at fixed-width):
1) the component labeled 4m7 is a 4.7 mOhm resistence?
2) I see the label 0.1uF but I dont see the condenser in the drawing!
3) the "thing" at the right represents the soundcard?
4) your comment " try differemt resistors 3.3M 3.9M 5.6M etc" meaning
in place of the 4.7 milliOhm?

.... sorry, but as I told before, I'm not exactly a great-master in
electronics!


thanks for your help!

Alessandro

.

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