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.


--
Cheers
Dave.

Dave Liquorice expressed precisely :
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.

Mains powered ones tend to be robust and er, well, loud.

Why not find what you need in a low voltage version and feed it from a
small wall wart? 12v output wall wart connected to a vehicle reversing
alarm perhaps.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

Harry Bloomfield wrote:
Dave Liquorice expressed precisely :

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.

Mains powered ones tend to be robust and er, well, loud.

Why not find what you need in a low voltage version and feed it from a
small wall wart? 12v output wall wart connected to a vehicle reversing
alarm perhaps.

Other option is put silicone in the sounder housing of a 240v one.
Not very elegant, but kills resonance.


NT

In article et,
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.

Anything that does that will be basically low voltage so I'd guess you
have more chance of finding a 12 volt one and use an external power supply.

--
*Change is inevitable ... except from vending machines *

Dave Plowman London SW
To e-mail, change noise into sound.

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

In message , mick
writes
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.

Sorry, but it's an unwritten rule of DIY electronics that you HAVE to
have a 555 timer on the board (even if it's not actually connected to
anything)



--
geoff