[Tomi Holger Engdahl]

"Ricardo MadGello" writes:

"Tomi Holger Engdahl" wrote in message
...
| just john writes:
|
| On 08/29/2006 08:58 PM, jwvm told the world:
| So some sort of small adapter would be really nifty. Do inexpensive
| versions exist, and if so, whaddya call them? My search engine
shots
| haven't yielded any happiness on this. Closest answer required
surgery
| on the mic to supply power.
|
| Computer microphones use electret capsules and require a bias voltage
| to operate. For more information, see this link:
| http://www.epanorama.net/circuits/mi..._powering.html
|
|
| IE: You're ALSO suggesting surgery. As I thought I'd implied rather
| strongly above, I KNOW THEY REQUIRE POWER!
|
| I was asking for an off-the-shelf solution, and what it's called by
| those people who sell them. No way such things don't exist.
|
| Cutting open each new headset after I'd sat on the previous one is not
| what I'm after.
|
| You don't necessarily need to cut open the headset.
| The document
| http://www.epanorama.net/circuits/mi..._powering.html
| has chapeter "Powering multimedia microphones using external power supply"
| that gives you information how to build external adapter box
| that you can plug between the headset mictophone connector
| and the 1/4" microphone connector.
|

The idea about needing to do anything to the headset is so lame. PC
microphones get their power from the sound card already. You only need to
make a box with 1/8" stereo male jack a batterry and a 1/4" mono output.

Find out which part of the 1/8" plug is the power connector and hook the
battery between that and ground.

In PC microphones the ring of 1/8" plug carries the power to the
microphone. The suitable power is 4.5-9V battery through 2.2 kohm
resistor. Don't forget the resistor. Without it the circuit would
not work with many PC microphones.

--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/