1 Attachment(s)
ATTN: FV24 owners: How to wire a microphone
there is a jumper next to the PCI slot for the microphone and speaker out. its pictured here which is also in the attatchment at the bottom of the page.
<img src="http://www.mp3car.com/vbulletin/attachment.php?s=&postid=68025"</img>
this next piece explains mic_in and mic_vcc and GND and how they work. its taken from http://www.epanorama.net/circuits/mi..._powering.html
Quote:
<h4>Sound Blaster way</h4>
<p>Sound Blaster soundcards (SB16,AWE32,SB32,AWE64) from
<a href="http://www.creaf.com/">Creative Labs</a> use 3.5 mm stereo jack for the
electret microphones. The micrphone connector uses he following wiring pinout:
<b></p>
<pre> / \
| | Audio signal
\ /
+===+
| | Bias voltage for microphone (+5V through 2.2 kohm resistor)
|===|
| |
| | Ground
| |
+=======+
| |
</pre>
</b>
<p><a href="http://www.creaf.com/">Creative Labs</a> has given the following
specs for the Sound Blaster microphone input in their web site: </p>
<pre> 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
</pre>
<p>
<img alt="Microphone connector wiring" src="http://www.epanorama.net/circuits/mic35.gif" width="326" height="99">
</p>
<p>The picture blow shows an approximate schematic of Sound Blaster Microphone
input circuitry. It shows my quess on the electronics inside the soundcard and
one typical wiring for a typical Sound Blaster microphone. </p>
<p>
<img alt="Sound Blaster Microphone Input" src="http://www.epanorama.net/circuits/sb_micinput.gif" width="365" height="171">
</p>