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Help needed to construct wireless headphones

Discussion in 'Electronic Basics' started by Gaurav, May 5, 2008.

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  1. Gaurav

    Gaurav Guest

    Hi everybody,
    It has been a long time since my college and I wish to brush up my
    learning that I once did. I am in need of a wireless headphone and
    would love to construct one of my own. I understand that the basic
    concept is that I channel the output of my music system to a FM
    transmitter and receive it in a small FM receiver that I can carry
    around in my pocket and listen to through headphones.

    If I am right so far, it boils down to constructing a FM transmitter.
    I came across some circuits, the easiest of which appeared to use
    BA1404 chip. Unfortunately, I could not find the chip. I came across
    some other simple digital circuits that used a set of NAND gates but I
    could not get it to work. It appears that a breadboard (of the type I
    am using to set my components on) is not suitaded for such fast
    circuits. Could anyone please me point to a simple circuit which:

    1. does not use too many components,
    2. works with stereo transmission (what is music without stereo,
    3. is easy to construct,
    4. works on less power (cuz I do not need to transmit beyond maybe 50
    feet), and most importantly
    5. is hard to go wrong with.

    I would be very thankful for your kind help in regaining my lost love
    of electronics.

  2. No, you're assuming the only way to do it is with radio. Right now you
    will see really cheap wireless headphones that amount to nothing more
    than an fm broadcast receiver in the headphones and a transmitter to
    match, but that doesn't mean it's the best route.

    Using IR (infrared) to transmit the sound may be better, and is hardly
    a new idea. They existed thirty years ago.

    Feed the audio into a voltage controlled oscillator running at some
    frequency above audio, and that feeds a string of IR LEDs. Then at
    the receiver, a photodiode or something to collect the IR light, and
    then a demodulator to turn it back into audio. No fussing with radio.

  3. Gaurav

    Gaurav Guest

    Interesting idea indeed. But would that not mean that I would have to
    remain in the line of sight with the emitters? Anyway, if it is easier
    to construct, I am all for it. Could you please point me to some link
    that does something of the kind. I will also google it up and see.

    Thanks again.

    PS: I guess, this will be a great learning experience. I would love to
    hear more and more ideas.

  4. Try:

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