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Subject: Re: External Mic preamp?
From: Manuel Dejonghe (limbus_at_gmail.com)
Date: 2004-09-07


Hi,

me too I am currently making some experiments with that.

The main problem is, as you already recognised, this is a line in, and
not for mics.
I bought an electret condenser microphone from sony (ECM-TS125) which
already has some kind of preamp. Unfortunately, this preamp is rather
a driver for the ecm. A normal ecm without that element would be very
weak on a mic in too.
I hoped, this element would raise the level high enough to get it
working on the line in. And it does, but still not high enough: If I
set up the gain to the max (+19,5 db) I still can normalize the
recorded file without having to cut out the peaks.

There are many preamplifiers, but not so much that are battery
powered, which is a not negotiable option for me.
There are some within high-professional-range with balanced xlr-plugs
as well as a digital breakout, but that's not what I need. Ok, it
would be fine, but it makes it not affordable anymore.
There are some around 50-100 euro on ebay, even within semi-professional range.
One of the cheapest solutions (30 euro) seems to be to buy the archos
microphone, which has a real amplifier and seems to be of a fair
quality, see the list for more comments.
I'll let you know if I am making progress.
One option is to design a small circuit myself. I'm not good with
that, but it may be the cheapest solution that meets my needs. I don't
specially need high quality.

regards, Manuel

On Tue, 7 Sep 2004 15:06:40 -0400, Shervin Riahi <shervin_at_gmail.com> wrote:
> Hey guys, I have a nice sony stereo microphone, but I notice (with
> much dismay) that it barely picks up any sound when I use it to record
> via my AJBR (running today's daily build). As a control, I plug my
> _headphones_ into the same port (the Line In socket), and voila, the
> device receives sound input and I can record (albeit at a very poor
> quality level). As such, I guess I need to buy some sort of preamp in
> order to boost the incoming signal, right? Any suggestions on an
> affordable one?
>
> Thanks in advance!!
>
> -Sherv
> _______________________________________________
> http://cool.haxx.se/mailman/listinfo/rockbox
>
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