help an old man

Discussion in 'General Electronics Chat' started by virginian, Dec 22, 2006.

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  1. virginian

    Thread Starter New Member

    Dec 22, 2006
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    I have a hearing problem and would like to get an fm transmitter to attach to my tv without cutting off the speakers. (my wife has good ears).
    I know their are transmitters available but the oriblem is connecting them without blowing the audio output on the tv. any ideas would be greatly appreciated. I am not up to date on my electronics. I did some work in the tv repair field, but that was 30 years ago . then i changed professions. so i guess i am a novice. thanks
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Hi,

    I use an IR transmitter & headphones from Radio Shack. I use a source switch to select between my VCR and DVD player. It has a 3.5 mm jack for headphones, which is where I hook in the IR transmitter. The headphones aren't too comfortable, but the volume control is pretty good.
     
  3. wireaddict

    Senior Member

    Nov 1, 2006
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    One way to be safe is to use impedance [Z] matching transformers between the speaker leads the transmitter audio inputs to isolate the TV audio outputs from possible grounds in the left and right transmitter audio input wiring.

    I don't know what the audio input impedance for the transmitter is, though it's probably at least 600 ohms; the speaker impedance is about 8 ohms so I'd get a pair of transfromers with a 16 ohm or higher windings to connect to the speaker leads.

    If you want to build your own transmitter, one source that sells FM transmitter kits is Ramsey. You can search for them on the internet & check out their kits. You can also ask them about the Zin of their transmitters so you can size the matching transformers properly.
     
  4. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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  5. Gadget

    Distinguished Member

    Jan 10, 2006
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    Most modern TV's have multiple AV sockets on the rear. If yours has an AV OUT or MON out as well as the normal AV inputs, then you are Home and Hosed. Just use the audio from the AV or MON out.
    If not, then you could use the Audio Out on the VCR (assuming you have one). The only hitch there is to make sure the VCR is receiving the same program as what you are watching on the TV....
     
  6. hgmjr

    Moderator

    Jan 28, 2005
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    Greetings virginian,

    Here is a product that I ran across during my last visit to my audiologist. It is call TV Ears. I don't have any personal experience with these so I suggest you do a little research if you have any interest in the product.

    hgmjr
     
  7. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I have TV Ears. It seems to work well, and does exactly what you want. It comes with good instructions, and is easy to hook up.
     
  8. Adjuster

    Well-Known Member

    Dec 26, 2010
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    There should be no question of blowing anything up, provided the TV is of a fairly recent type suitable for use with external audio equipment. You really do need to be sure about that before going ahead with it though.

    Very much older television sets may indeed be difficult or even unsafe to use in this way, and certainly for a long time in my country many valve (vacuum tube ) and even semiconductor sets did not have their circuits isolated from the mains, leading to potentially fatal results if users tried to connect headphones etc.

    While it is possible to imagine using an isolation device such as an audio transformer to get sound from such an older TV in reasonable safety, this may not be an advisable project for someone in your circumstances of age etc. Perhaps it is time to consider a new TV, or perhaps for a cheaper option a smaller set with earphone socket for your personal use?

    I don't want to sound patronising, but if this is not fairly obvious to you, you really should think about getting someone to help you out in person.
     
  9. Wendy

    Moderator

    Mar 24, 2008
    20,732
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    Gentlemen, this thread is 6 years old. The OP is long gone, so I am driving a steak through this threads necromantic heart.
     
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