Re: Telephone handset amplifier

John Ferrell wrote:

It looks like the answer to your question is that the collective
wisdom on this newsgroup is not up to the requested task.


You have added nothing useful.


I would also like a device like that, especially if it could help me
communicate with some of my more hearing impaired friends. If my
yelling into the handset makes it work I expect that it is possible.


You really don't understand HOW a telephone works, do you?


I know it would be best if I could get the amplification upon the
other end but I only have control of my end. There seem to be devices
advertised as solutions but I have yet to hear anyone willing to say
they actually work.


There were good optional handsets for the WE 500/2500 series
telephones made for people with hearing problems. The amplifier was in
the handset, along with a thumbwheel volume control. They worked quite
well.


Without knowing the circuitry in the phone being used, there is
little to no chance of offering a design that is line powered, and
connects directly to the telephone. The simplest fix is to buy a
telephone made for the hard of hearing. Their telephone company may have
them available.


I have a drawer full of headset telephone devices that don't do the
job including one rather pricey Plantronics unit.


What job were they made for, and how did you try using them?


Ideally the device would plug into a telephone with a jack, have
adjustable level controls, some frequency shaping and
anti-feedback.qualities. It would also use an inexpensive computer
headset to permit simple replacement of the part that wears out.


Ideally, they would use a telephone designed for the hard of hearing
that meets their local codes and regulations.



I realize that English speaking engineers that can solve this problem
are becoming increasingly scarce.


Having a ham radio license doesn't mean you know anything about
electronics. I lost count of the ones who couldn't even solder four
wires to a microphone plug, or put a PL259 on coax without shorting it
out.


John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps"


Its even easier to use a stump grinder and get rid of the damn
things.


If you find a practical solution, please let me know...


If you come up with a complete set of specifications, let us know.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
.

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