<a href="http://www.andreaelectronics.com/Buy/ProductDesc/MC100.htm">http://www.andreaelectronics.com/Buy/ProductDesc/MC100.htm</a><br><br>This is the AAA battery powered microphone amp with speaker/headset switcher that I use.  The company Andrea has an extensive line of pc/telecom products.  I advise calling them to describe exactly your issue.<br>
<br><br>ANDY<br>