On Tue, 31 Jul 2007 20:37:13 GMT, Joy wrote:
Does anyone know where I could buy a cheap DTMF tone generator?
I think that's what they are called. They used to be used to enter
touch
tone phone sounds into the receivers of dial pay phones so you could
access your answering machine.
I know someone who only has rotary phones (she claims they are the
only
ones that work with her hearing aids) and is moving to a place where
the
main door can be remotely opened by pressing a key on her phone.
Since she
doesn't have a touch tone phone, I thought a portable tone generator
might
work. Radio Shack doesn't carry them and I don't know where else to
look.
Yes, I could always hook up a small, touch tone phone next to her
dial
phone but then she couldn't easily move it between phones. Maybe a
cheap
cordless phone would work. Those I have.
Does anyone know where I could get a tiny wired phone? I had once
once
(Radio Shack) and it was 2 x 1.5 x .75 inches with a 2.5 mm plug for
a
mic/headset just like those used on cordless and wireless phones. It
even
had "to line" and "to telephone" jacks.
Thanks for any leads or even the right search keywords on ebay. I
didn't
find any with my searches.
And sorry if these aren't appropriate newsgroups. I thought people
here
would know about this stuff!
Thanks! Joy
I am guessing that your friend uses an analogue hearing aid. If this
is so and it is a behind the ear type then it should have a switch on
it with a 'T' position (Telephone). The switch should be in this
position when she is making or receiving calls. The older rotary dial
phones probably have a more powerful magnetic circuit in the receiver
and that is why these work and the dtmf types which she has tried
don't.
The problem can be quite easily be rectified by purchasing a dtmf
phone which is hearing aid compatible. These types have an additional
inductive loop coil inbuilt to provide a suitable signal level for
pick up by the hearing aid when it is switched in the 'T' position.
http://telephones.att.com/telephones...8&parent=20017
At $15 I doubt you could do it much cheaper and you won't have an
extra piece of junk hanging around just to provide dtmf.