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The Daring Dufas[_5_]

wrote:
On Thu, 20 Nov 2008 22:38:04 -0600, The Daring Dufas
wrote:

Jeff Wisnia wrote:
The Daring Dufas wrote:
Bill wrote:

I had a friend some years ago who ran the communications
division of the local power company. This was back when
they had HF radios for communications and the techs actually
had to know something about electronics. They would get
electronic interference complaints which were often traced
to doorbell transformers. It was a very common problem and
one that many people don't even think of today.

TDD

Sorry, but I have a hard time believing that.

If it was "a very common problem", can you offer a cite proving that a
60 hz transformer and 10-50 feet of unshielded wire with 24 vac on it
can cause interference at radio frequencies?

Wouldn't you expect that if that story was true those big pole pig
transformers and all that higher voltage wiring running on the poles on
nearly every street would have caused the radios to melt? G

Jeff

Do you know what voltage most (USA) doorbells operate on?

TDD
I've got 3 different ones floating around - 12, 16, and 24 volts AC.
(They would work just as well on lower voltage DC)

Dang! Nobody seemed to get the little dig at Jeff.
What you will find are 6, 8, 10, 12, 16 and 24 volts
AC. Some really old stuff will be DC dry cell powered
but only if the owner wants to keep it original for
nostalgic or antique collecting purposes. Most of the
doorbell transformers I install have triple taps for
8, 16 and 24 volts. Many doorbells will need a 10 volt
transformer and if you need 24 volts to ring your ding
dong you're either deaf or have a seriously complicated
system. I have setup some serious systems for industrial
and commercial buildings by making use of the very loud
and fun to play with devices manufactured by Edwards
Signaling which now belongs to GE. My personal favorite:

http://tinyurl.com/5zkoow

TDD