Need Assisted Listening circuit for hard of hearing

[graygem]

I need to build a phone circuit for the hard of hearing. I need to connect fron the handset with a line level output(3.5mm) to go to my inLOOP induction loop driver. Everything that I've tried gives me too much noise. I've even tried Radio Shack's handset phone recording control(43-1237). I need something that gives me a clear audio. Any help would be much appreciated.

 

[mickeymoose]

I have installed a number of assited listening systems, including induction loops. Show us your physical lay-out (# of listeners + placement, area covered, etc) electronic lay-out and circuitry. With more detail you may get help. And: Radio-Shack ain't gonna do it for ya! E

 

[graygem]

Thanks for replying. As I said, I'm in need of a phone circuit. I need to plug the phone handset in and pull the handset audio coming from the speaker and bring it out a 3.5mm plug so that I can put it into a loop driver. It is for a office receptionist who is hard of hearing and would like to receive the phone audio through her hearing aid's t-coil. So she will be just using a cushion loop. She would also like to add a counter mic too, but I thought if I could get good audio from the phone, I could work on the mic mixer after. Any help would be appreciated. The part from Radio Shack is a handset recording device which puts out the 3.5mm plug but gave me a terrible audible hum. Thanks.

 

[mickeymoose]

The telephone system is balanced and floating. Introducing a groundloop will give you hum and noise.
You propably need an isolation transformer between the handset and the cushion loop amplifier (not familiar with that product).
The T in T-coil of the hearing aid stands for telephone. Newer handsets have shielded earpieces that do not work with T-coils. Maybe your local hearing aid store sells unschielded handsets. Alternately, google "amplified telephone handset" and you will find a number of vendors. E