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'[OT]: AGC circuit required for electret mic'
2002\04\27@100716 by Gary (REMOVE THIS)

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Hi,

Anyone have a circuit that will give more or less constant output using a electret mic as input, even if you are 1 metre or 5 metres from mic? Circuit must be low cost, low current would be good <1ma? and simple if possible?

Thanks Gary

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2002\04\27@151225 by Rick C.

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Well... let's see.... a typical miniature electret mic draws between 0.5 and 1.5 ma. You're asking the balance of the circuit to draw less than 0 ma right?
The dynamic range to provide a constant output at your two limits will probably exceed 50db. I hope you're not thinking of running this on 5 volts are you? The control voltage/current of the circuitry to adjust gain of your
compressor, the shunting or "compressing" of the audio alone will exceed a few ma. Are you sure of your requirements at this point?
Rick

"Gary (REMOVE THIS)" wrote:

> Hi,
>
> Anyone have a circuit that will give more or less constant output using a electret mic as input, even if you are 1 metre or 5 metres from mic? Circuit must be low cost, low current would be good <1ma? and simple if possible?
>
> Thanks Gary
>
> --
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2002\04\27@152326 by Dwayne Reid

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At 03:02 PM 4/27/02 +0100, Gary (REMOVE THIS) wrote:
>Hi,
>
>Anyone have a circuit that will give more or less constant output using a
>electret mic as input, even if you are 1 metre or 5 metres from mic?
>Circuit must be low cost, low current would be good <1ma? and simple if
>possible?
>
>Thanks Gary

What is the intended application?  Do you need to preserve the envelope of
a speech or music signal or is the signal a tone of some sort?  What output
signal level do you need from the circuit?

The problem is that there are MANY techniques available to you: ranging
very cheap limiters (clipping circuit) on through very complex (maximize
modulation level for a broadcast transmitter).  You need to specify what
you need.

dwayne


Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

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2002\04\27@154852 by David Covick

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Gary,

I've sent you a schematic off list of what I use for my ChipCorder
(ISD4002).
This works very well, not know what exactly you are looking for.

David

{Original Message removed}

2002\04\28@133506 by Gaston Gagnon
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David Covick a icrit :
>
> Gary,
>
> I've sent you a schematic off list of what I use for my ChipCorder
> (ISD4002).
> This works very well, not know what exactly you are looking for.
>

Could you please send me a copy of your schematic ?
Thank you.
Gaston

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2002\04\28@163430 by Cristian

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>
>Could you please send me a copy of your schematic ?
>Thank you.
>Gaston
I'm interested too.
Thanks,
Cristian

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2002\04\30@111124 by Scott M. Thomas

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I would be interested in a copy of this schematic as well.

Would you please send me one, too?

-----Original Message-----
From: David Covick [.....dacKILLspamspam@spam@WEST.NET]
Sent: Saturday, April 27, 2002 3:47 PM
To: PICLISTspamKILLspamMITVMA.MIT.EDU
Subject: Re: [OT]: AGC circuit required for electret mic


Gary,

I've sent you a schematic off list of what I use for my ChipCorder
(ISD4002).
This works very well, not know what exactly you are looking for.

David

----- Original Message -----
From: "Gary (REMOVE THIS)" <.....questuk1KILLspamspam.....HOTMAIL.COM>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Saturday, April 27, 2002 7:02 AM
Subject: [OT]: AGC circuit required for electret mic


Hi,

Anyone have a circuit that will give more or less constant output using a
electret mic as input, even if you are 1 metre or 5 metres from mic? Circuit
must be low cost, low current would be good <1ma? and simple if possible?

Thanks Gary

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