microphone preamp

hi i don't know from which place ur from, if ur in Bangalore, visit to SP road were u find all types of electronics gadgets, if ur in any other places visit to ur near places were all types of electronics goods are sold and serviced, when u go there ask for VEGA KITS booklets, in which u find all type of electronics project for beginner and expert using this project u will improve ur skill in electronics

there many types of microphone preamp,

1. type of microphone,
2. type of enviroment
3. economy circuit all this is available in VEGA KITS try this out or log on to
   formatting link
   and build ur own circuits

take care when assembling components

What is the problem:

(1) Is the recorded sound too weak?

(2) Is there too much background noise in the recording?

(3) Is there too much echo in the recording?

(4) Is there too much bass or too much treble?

(5) All the voices sound like xylon robots?

(6) One or more of the above?

balanced one ?

the cheap one!

Ancient_Hacker ha scritto:

the problem is (1): recorded sound almost inaudible [on the software side the rec levels seem to be allo OK]

** See:

Provided you have a decent balanced dynamic mic and not a POS electret capsule.

....... Phil

A PC sound card is designed to work with an electret mic. You are probably using a dynamic mic.

Try typing "microphone amplifier" into Google, It's amazing what turns up.

--
John B

Maybe try:

Just power it up with 10Volts.. Just something left over from my audiophool days :)

D from BC

Well, this is puzzling. If the record levels, as shown on the "VU Meters", are okay, then the recording should be okay.

How about you post the audio file somewhere where we can all listen to it?

I built one of these once, albeit I don't remember the component values exactly:

It was a Radio Shack dynamic, marked "600 ohms", for what that's worth.

It boosted the mic so that the sound card could "hear" it. One difference is, I dropped RL, replaced RC with a pot, and connected CL to the pot's wiper, then went right from CL to the sound card input.

Good Luck! Rich

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

jasen ha scritto:

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

oops! should be a big M there 4.7M Ohm resistance.

that was an accident in editing, there is no second condenser. ignore that.

that's meant to be the microphone.

Sorry, as above, that was intended as megaohm.

Revision 2: (use fixed-pitch font)

tip ---------+-[4M7]-. | | \\ | \\| | +|| 2.2uF soundcard |----+----||------------. mic socket |/| || \\_ | /~ BC547 ( )| mic | /~ | sleeve ------+--------------------------'

Bye. Jasen

You've drawn this backwards! It should be:

.-[4M7]-+--------- tip | | | / 2.2uF ||+ | |/ .------------||----+----| soundcard | _/ || |\\| mic socket mic |( ) BC547 ~\\ | ~\\ | '--------------------------+------ sleeve

The signal should go from left to right, just like we read. :-)

Cheers! Rich