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Thread ID: 30722	2003-03-01 03:30:00	Headset Mic refusing to work	somebody (208)	Press F1

Post ID	Timestamp	Content	User
124795	2003-03-01 03:30:00	Hi, I'm trying to get a headset mic (Cosonic Stereo Dynamic Headphones with Mic - from Warehouse Stationary) to work through a PA system Sound Mixer. I know that these mics are designed to be used with computers, but I want to get one working through our PA. Theoretically it should work (though it doesn't), as the computer's soundcard gives +20db of gain, while the mixer can give up to +60db. Does anyone know how I can make this work?	somebody (208)
124796	2003-03-01 03:56:00	These mics are of the "electret" type and need a dc supply of a few volts which is provided by a sound card, have a look at this site: www.hut.fi	Terry Porritt (14)
124797	2003-03-01 05:28:00	So does that mean it wont work? I have the same problem, and couldnt understand all that stuff.	mejobloggs (264)
124798	2003-03-01 05:34:00	Clueless will know. He works with this sort of stuff for a crust	Baldy (26)
124799	2003-03-01 06:37:00	What the article boils down to is that a dc voltage of +5v has to be applied to the middle connection of the stereo plug via a 2.2Kohm resistor, 0v to the inner ground connector, and the audio is taken out from the tip of the plug through a 10uF capacitor so as to isolate other circuitry from the bias voltage.	Terry Porritt (14)
124800	2003-03-01 06:46:00	Thanks for the info Terry. I will have a go on Monday, once I manage to find these parts (I have them lying around somewhere).	somebody (208)
124801	2003-03-01 11:35:00	I asked a similar question a couple of months ago and some one suggested I look at this link www.shure.com Also the battery powered preamp that comes with Dick Smith Microphone c1533 also makes computer haedset mics work with a pa amp. Not sure if you can buy the preamp by itself. Cheers, Andrew	Andrew B (867)
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