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  1. #1

    Default PC Headset

    I have a Lexma X255 headset, works excellent on a PC. I want to fit it onmy transciever, but I am puzzled with the mic connection. It has the usual 3.5mm jack, with a tip, ring & sleeve. The connection to the PC soundcard input is indicating that both the 4.5 volts supply and the audio output are coming from the tip. When tried to feed it this way, with a 10uf dc blocking capacitor, it did not work. Anyone can help please. Thanks
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  2. #2
    Join Date
    Jan 2000
    Location
    Dahlonega, GA
    Posts
    1,161

    Default

    Hi Paul,

    I use a PC headset and this schematic is a simple one, but it will work fine. I use about an R(b) of about 15k and a coupling cap ca range between 0.02 and no greater than 1uF. If I go above 1uF, then the radio developed a pop on some peaks. The resistance there at Z(i) is used to match the circuit to the mic impedance the radio needs to preform best.

    Anyway, try this and see how it works for you.

    sb_micinput.gif

  3. #3
    Join Date
    Jan 2002
    Location
    harms way
    Posts
    13,615

    Default

    Is the cap blocking the needed voltage to the electret? I have an old pc headset to try and I'm gonna keep it real simple; snip the stereo plug ends off and wire directly to an 8 pin mic connector and see how it fares running vox.

  4. #4

    Default

    electretMIC.jpg

    Here is a variation of the circuit. I've used it many times and it seems to be solid.

    Some rigs are more susceptible to RFI, and the use of by-pass capacitors and RF chokes is required. RFI sounds like distortion or squelch noise on the transmitted audio.

    In addition, acoustic feedback can be an issue with some of the cheaper headsets when the "monitor" function of the radio is used. You'll hear a squeal and the radio will go to full power. Simply turn off the monitor feature and try again.

    Some headsets sound hollow. This can be caused by the plastic walls of the boom. I've used putty to dampen the walls. A hollow sound can also be caused by the "monitor" function being set to high, but short of causing a squeal.

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