The Daring Dufas wrote:
Bill wrote:

Wired doorbells have a transformer which is always on and always using
electricity. This is yet one more thing in the house which does this
like TV, microwave, remote control things, things with clocks, plug-in
phones, etc.

These things add up...

I replaced/rewired my switch so the transformer is only on when the
doorbell button is pressed! Thus the transformer is off most of the
time now.

I installed a regular electrical box at my front door, ran 14 ga.
romex from this box to the doorbell transformer, then got a nice brass
blank wall plate, drilled a hole in this plate, then installed a 120V
momentary push switch in the plate. Then wired this to switch on the
transformer when the button is pressed. Then connected the two wires
which were going to the old button so the doorbell would ring as soon
as it receives power from the transformer.


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

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.