Rockbox mail archiveSubject: Re: Microphone.
From: langhaarrocker <phil_at_x-phobie.de>
Date: Sun, 20 Oct 2002 12:43:07 +0200
On Sun, 20 Oct 2002 01:19:11 -0500, "Garrett"
>If you want to capture the full frequency range you will need a condensor
>mic, not a dynamic. (A dynamic mic is essentially an electromagnet, with the
>coil mounted on the diaphram. This weighs down the diaphram and kills the
If it was that easy there wouldn't be any dynamic microphones around
any more. Every microphone sounds different and it is a question of
taste, not a question of the frequency range, which mic to choose.
Concerning the upper frequency range: especially with the jukebox
recorder you can almost neglect this as it's analog input doesn't
capture frequencies > 15kHz. That's about the range of a Shure SM58,
the standard vocal mic (dynamic).
>A condensor mic is essentially a capacitor. The diaphram has to be charged
>all the time, so the mic needs a constant direct current, i.e.
>"plug-in-power" or "phantom power".
The mic doesn't draw a constant current. It has to be supplied with a
voltage, though. The voltage source must have quite a high inner
resistance -> striclty speaking it can't be a constant voltage source
as this would disable the condenser mic to alter it.
>Since the JBR has only line in (meaning
>5V, way more than a mic produces), you also need a mic preamp (or else a mic
>with a built-in preamp).
Watch out! 5V exceeds the absolute maximum ratings for the analog
inputs of the MAS! (Datasheet Page 56) The datasheets claim the MAS to
clip at 3.2 V on analog input when operated at 3V.
Received on 2002-10-20