4850ff36$1@news.povray.org...
>>> Actually I'm pretty sure my PC microphone is a crystal mic...
>
>> UH? do they still sell that? Usually they are electrets
>
> Sure - why not? They sell crystal ear pieces too - very useful with 
> home-made crystal radio sets. And let's not forget, picture speakers use 
> crystals too...
The frequency response of crystal microphones is often limited to a 
relatively narrow band . They boost treeble and have poor basses.
It may be good for a close-miking of voice to enhance speach recognition but 
they are far from all-purpose applications.
>
>> It means a moving coil microphone, no need for power
>
> Right. So a reverse speaker then?

Exactly but not optimized for that use :-)
>
>
> OK. So assuming it really is electret, I can't measure its impedence 
> meaningfully.
>
> I'm 70% sure this is the guy BTW:
>
> http://www.maplin.co.uk/module.aspx?ITAG=SPEC&ModuleNo=24698&doy=12m6#spec

The *stereo* (the exact name is TRS for Tip/Rim/Sleeve) jack for a mono 
microphone makes me suspect it is an elecret.
The rim is for power +.

Marc

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