5 Sep
2009
5 Sep
'09
9:32 a.m.
>How many modern handsets can even fit an acoustic
coupler? The one
I am pretty sure I've seen an acoustic coupler consisting of separate
microphone ans speaker units with elastic velcro straps to fix them onto
just about any handset.
[..]
I have to place an order for 2500 sets every 6-8
months. I order about 5 at=
=20
a time. Wish I could remember the brand I got last time. Had one die after=
=20
15 days- mechanical bell-chime ringer wouldn't work, checked continuity to=
=20
the coil, all good, still no ringy-dingy.
Do you mean that the coil was continuous, or that you know all components
in series with the coil were good (e.g. a capacitor)? Was the ringer
mechancially jammed?
I bought an interesting model 746 (common UK telephone) a couple of
months back. It has a neon lamp in the handset which flashes when it
rigns (wired in series with the ringer) so that you can tell which 'phone
is ringing if you have several on a desk. And it has the amplifier and
coupling coil in the earpiece for use with hearing aids. Anyway, I was
told it didn't ring (and that it wasn't supposed to, which is nonsense).
When I took the cover off at home, the dial fell out. Lookig at it, I
noticed a missing fixing screw. I was about to raid my hardware box for a
6BA screw when I noticed the original -- stuck to the magnet of the
ringer and jamming the armature. Put it back in the right place and of
course it rings properly now.
-tony