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Subject: Re: Microphone Question
From: Chris Holt (amiga2k_at_cox.net)
Date: 2003-04-26


On Sat, 26 Apr 2003 01:17:57 -0700 (PDT), Add Subtract wrote:
>Hi Jos,
>
>On the junky little microphone I tried at Radio Shack there was a
>battery on the cord with an on/off switch. Is this the preamp? It
>seemed to record ok, only on one channel.

It is not a preamp, but rather bias power for the single transistor in
the electret microphone. This does amplify the signal slightly. Enough
so that you can record some sound, but you will have to turn the gain up
so much for recording, you will get noise. (the resulting recordings
will not be much better than the built in mic)

There is one application where this works fairly well. A very sensitive
electret mic with it's own bias (battery) will work well for recording
loud sounds, as in a live band etc.

>When you tried your little Sony mic, what happened? Did the Archos not
>record any sound at all?

The mics that require "plug in power" like the ones the two of you have
mentioned will likely not be able to record anything at all. Their level
of output is virtually nil.

>I told you I was dense LOL!!!!

But there is lots of information that you can read on the web about such
things. A good search engine like Google and a little initiative will go
a long way toward "thinning the skull", and expanding the brain.

Search for things like electret mic, condenser mic, recording, archos,
external mic, amplified mic, etc... in various combinations.

Chris



Page was last modified "Jan 10 2012" The Rockbox Crew
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