Dunno but transformers buzz as do ballasts etc running at 50 hz, so if you
know the voltage and current needed for the device I'm sure a suitable
switch mode module will be available, but don't then moan if all the radios
in the house are prone to interference.
Brian

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From the Sofa of Brian Gaff Reply address is active
"DerbyBorn" wrote in message
2.236...
I used to have a separate doorbell transformer. During some kitchen work
the electrician fitted a new transformer inside the consumer unit. I can
now hear a (50Hz)buzz in the bedroom above.

At the moment I am not fit enough to do any streching to try relocating it
or trying to mechanically isolate it. I am wondering it an electronic
voltage reduction device is available that could be smaller and not liable
to vibrate.
The door bell - is a load buzzer.

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DerbyBorn