On Tue, 11 Mar 2008 16:09:00 +0000, Dave Liquorice wrote:

Does anyone know of a sounder suitable for mains use that won't deafen
people within 10 yards. Ideally all I want is quiet beep 15 sec pause
beep 15s and so on.


This *is* a DIY group... build your own! ;-)

stripboard & soldering iron time!
a dual 555 timer - first half gates the second half at repeat speed.
second half provides the beep and is connected to a piezo speaker.
then just a little power supply.

Masochists could use a PIC chip and piezo speaker with some programming
instead of the dual 555 and components.

Alternatively, have a look for a device called a Sonalert or Cybertone.
These used to be available from people like RS or Farnell in 240vAC
versions but most of them are low voltage. Most mains sounders are too
loud for what you want. It may be better to choose a low voltage, low
output device and use it with a pregnant plug power supply.

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info http://mixpix.batcave.net