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Subject: RE: Re[2]: Microphone.
From: Matthew P. OReilly (moreilly_at_moreilly.com)
Date: 2002-10-19


>>
Hello M.,
<<
Hey, U!!

(Sorry, I couldn't resist.) <grin>

>>
I had the same problem: I wanted to connect an electret condenser mic
capsule / such a mic to the AJB. I think the only way is to connect a
mic amplifier to the AJB.

I soldered one with an operational amplifier in it - that means it needs
power, which I took from a 9V battery. The mic capsules also needs power
(>1,5V, ~2mA).
<<

JimG and I had a good off-list discussion about this... he sent me some good
links, which I pass on to you:
http://www.shure.com/support/technotes/app-soundcard.html
(This describes part of the problem, but doesn't give really us an
applicable solution.)

http://shure.custhelp.com/cgi-bin/shure.cfg/php/enduser/std_adp.php?p_sid=cb
NSM3sg&p_lva=&p_faqid=38&p_created=950083200&p_sp=cF9ncmlkc29ydD0mcF9yb3dfY2
50PTI3NTkmcF9wYWdlPTE*&p_li=
(This one actually gives three solutions. The middle one is the one we're
interested in. There's a really good link
to a white paper about transformers, too.)

http://www.shure.com/accessories/a96f.asp
http://www.minidisco.com/minispecs/fel35mx.html
These are actual products which should do what we want. The Shure cable is
about $50 *less* than the other one.

I just ordered one of the Shure cables from:
http://www.mwsound.com/commerce/ItemView.cfm?INV_ID=2887

Big thanks to JimG for finding all this.

>>
A dynamic mic has a greated output power, so it works with a smaller
amplification (or maybe without an amplifier?). There exist simple
amplifiers with transistors. So I think that's why the Archos mic is a
dynamic mic.
<<
I'll try both when I receive them and let you know what the verdict is.
Hopefully this cable will be sufficient for either type of mic.

>>
Bye, Uwe.
<<
Heh, see "U".

(Last one, I promise. :-)



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