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headset boost

Discussion in 'Electronic Basics' started by Daniel Inston, Nov 19, 2003.

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  1. I've attacked an old cordless phone and wired in a headset so that I can use
    it hands free. I simply disconnected the phones mic and speaker and wored
    them up to a headset socket.
    While the mic works well; other party can hear me, I find that the earpiece
    of the headset, even with the volume up loud is not quite enough if there is
    any background noise.
    So what I want to do is boost the phones speaker volume slightly so that the
    volume control on the headset has some range to it. I thought that a garden
    variety transistor might do it, along with a resistor or two.
    Problem is - I dont know how - I can only follow instructions when it comes
    to this sort of thing - so I am hoping that someone here will provide some
    help.

    Thanks in advance.
    Daniel Inston
     
  2. David Wood

    David Wood Guest

    You won't like this advice but, throw away the mess you've made and
    buy a cheap commercial headset. After everyone you talk to on it
    complains about the poor quality of the sound, resume using a handset
    or buy a much better headset.

    By the way, I've recently discovered a way to more easily move things
    from place to place that employs a section of tree trunk with a hole
    in the center and a stick through the hole.
     
  3. JeffM

    JeffM Guest

    By the way, I've recently discovered a way to more easily move things
    C'mon. David Wood is just an alias, right?
    Your real name is Gallagher isn't it?
     
  4. David Wood

    David Wood Guest

    No, but sometimes watching people do things in the most difficult and
    expensive way they know while asking others to advise them of even
    more difficult and expensive variations is a bit much for me and my
    sense of humor kicks in.
     
  5. The handsets I've worked with use a 150 ohm element, so your problem
    is probably that the headset you're using is a 16 ohm headset, and
    needs a matching transformer to match it to the 150 ohm output. This
    can be a very small transformer, and using a transformer means you
    won't have to waste any battery current.

    If you must use a device, try the LM386, which is available at Radio
    Snack. It needs a minimum of parts and doesn't need much current.


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  6. Ardent

    Ardent Guest

    X-No-Archive: yes

    Well, my Dad is hard of hearing and he found it irritating to switch
    to T-coil and adjust the volume everytime there was a call for him. I
    fitted a 386 inside the base instrument of the nomal telephone and now
    my Dad is making more calls without bothering with his aid!!

    HTH
     
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