"WeeBob" wrote in message
...
Hello.

I have an old wired doorbell that has an 18V DC power supply. The actually
transformer has been (I think) channelled into the wall, or underfloor
boards in the attic. i.e. hard to get to.

A new fancy doorbell requires connection to a 8V AC power supply.

Is there a simple way to do this? i.e. 18V DV in, 8V AC out?

It may well not care about getting DC instead of AC, it might
well just rectify that and rectifying DC will still work fine.

Not always tho, particularly with more fancy stuff like modems,
and external hard drives, they can generate a variety of voltages
from the AC and when supplied by DC can't do that.

The difference between 18V and 8V is more of a problem tho
and it isnt trivial to reduce that without using a voltage regulator
that you presumably dont know much about if you have to ask.