Laurence Payne wrote:

On Sat, 23 Oct 2004 19:21:39 +0200, JW
wrote:

I'm trying to find out if there is a way to connect the REC/Phones output
of my Roland Micro Cube amplifier to a Microphone input on a laptop.
Assuming the Mic-In is low impedance, is there a way to convert the high
voltage line signal of the amp to the microphone input? All I found so far
is to do the opposite: connecting a mic to a line input. Where can I buy
such a impedance matcher?

Also, I would like to know if it is ok to connect a 600 Ohm mic to a
10kOhm mic input.

A quick Google found this. Still true for non-specialist computer
sound systems I think.

I have found this answer myself too, this is not the problem. All my
connectors are mono anyway.

The main points are that the mic input is mono. Ring doesn't expect
one of the stereo channels, it outputs a voltage. This is current
limited, you'll do no harm to computer or source by connecting to it.
But you won't get one channel of your music.

So you need a cable that connects both stereo outputs to tip of a
3.5mm jack plug.

You'll need to adjust the output level of your source way down. The
computer's software mixer almost certainly acts on the signal after it
has been digitised. It can't compensate for overload at the input.
And you have the potential for MASSIVE overload here. Nothing will
blow up, but it will sound terrible :-)

This is the description of my problem/question, not an answer! ;-)

.................................................. .................................................. ...........
Soundblaster soundcard series (SB16, SB32, AWE32 and AWE64) have all a
microphone input designed to be used with the electret microphones
which come with the soundcard package (some packages) or with separate
microphone designed to be used with SoundBlaster soundcards (there are
separate microphones and some monitors have built-in microphones like
this).


Typical characteristics of Sound Blaster microphone input:
Input Type: Unbalanced Low Impedance
Input Sensitivity: Approx. -20dBV (100mV or 0.1Volt)
Input Impedance: 600 to 1500. (Ohms)
Input Connector: 3.5mm Miniplug (Stereo Jack)
Input Wiring: Audio on Tip, Ground on Sleeve, 5Volts DC Bias on
Ring

Now, this is useful info. I couldn't find info like this on the Creatives
website...

Because the microphone input needs very high input levels it is not
suitable to be used with any other micophone

best,
Jeroen