[linux-audio-user] USB 1.1 soundcard

anahata anahata at treewind.co.uk
Mon Nov 15 16:16:36 EST 2004

On Mon, Nov 15, 2004 at 09:21:32PM +0100, Arnold Krille wrote:

> Condensor mics have a condensor which only needs to be charged, for the rest 
> they only need low current (dont know exact numbers).

About 2mA for many mics.
The specification for phantom power says that the 48V behind the 6k8
resistors should remain stable for current drain up to 10mA. Apparently
some phantom power supplies fail to meet this and won't work with a few 
mics that do draw that much.

> And most mics are able 
> for 5V to 52V or something like that

Some externally polarized condensers quite intolerant of 
sub-standard power.
Many so-called condenser mics are in fact electrets. Their only
need for power is for the FET amplifier which will work on anything
over about 1V internally.

anahata at treewind.co.uk -+- http://www.treewind.co.uk
Home: 01638 720444         Mob: 07976 263827

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