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Topic Title: Ding Dong
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Created On: 30 November 2012 06:18 PM
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 30 November 2012 06:18 PM
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mrcornbeef

Posts: 245
Joined: 05 December 2005

Any of you lads got experience of putting a door bell in a commercial
building its factory they have asked for a standard bell the run is over 50 metres from push to bell so big volt drop if i go for 12 volt i was thinking of using a weather proof retractive switch so i could put a more substantial cable in or a cat 5 with cores doubled up to give more csa
any recommendations ?
Thanks
 30 November 2012 06:22 PM
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beaver74

Posts: 361
Joined: 07 February 2007

a dome type bell will need a great deal of voltage to run it over 50m can you not talk then in to a electronic fire alarm sounder which you can change the sound to suit and will be heard clearly as well
 30 November 2012 06:24 PM
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Fm

Posts: 646
Joined: 24 August 2011

Use 8 core alarm cable.
Each core can take 1 amp at 50 volts.
Double, treble, quadruple as required,
Nice and flexible, easy to,conceal beside architraves etc
Mk doma waterproof ipmrated doorbell
 30 November 2012 06:28 PM
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mrcornbeef

Posts: 245
Joined: 05 December 2005

Thanks for replies i asked about a sounder but she wants a bell sirens get on her nerves
will have a look at the mk domma
cheers
 30 November 2012 06:32 PM
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OMS

Posts: 19469
Joined: 23 March 2004

It's what little relays and plastic boxes were made for.

Put the bell with it's transformer where the client wants it and switch it through a relay powered near the push end. That way the bell sees almost no voltage drup due to cable length and the relay imposes almost no demand on the long push circuit so voltage drop is negligible

regards

OMS

-------------------------
Failure is always an option
 30 November 2012 06:34 PM
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Inrush

Posts: 694
Joined: 19 December 2007

How about using two bell transformers, the first supplying a remote 12V relay coil (local to the bell), the second to energise the bell from the relay.
 30 November 2012 06:49 PM
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mrcornbeef

Posts: 245
Joined: 05 December 2005

Like the relay ideas !
 30 November 2012 09:17 PM
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Avatar for Legh.
Legh

Posts: 3472
Joined: 17 December 2004

Why 12v?
You can get 230V Sirens. Try a 12V relay coil with beefed up mains switch contacts to switch the sirens.

Legh

-------------------------
Why do we need Vernier Calipers when we have container ships?

http://www.leghrichardson.co.uk

"Science has overcome time and space. Well, Harvey has overcome not only time and space - but any objections."
 01 December 2012 05:27 AM
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ebee

Posts: 5667
Joined: 02 December 2004

No need for two transformers.
Just make the bell circuit and relay circuit parallel to the transformer as OMS says just make sure the Tx to bell run is short for volt drop and the Tx to relay run can be quite long and the relay will still work fine.

-------------------------
Regards,
Ebee (M I S P N)

Knotted cables cause Lumpy Lektrik
 01 December 2012 12:57 PM
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jcm256

Posts: 1841
Joined: 01 April 2006

Just watch your voltage there, the whole point of transformer doorbell is you can have a little light in the push or pushes, in contrast to those wireless ones you stick on that last no time. Not very green though 24/7 they the little filament lamps do turn the meter and can tremble the bell hammer if the resistance is not quite right. Wonder if you can get a LED illuminated push now, I am sure you can, has been long time since wired one all be it a few replacement pushes due to water ingress.
.

Edited: 01 December 2012 at 05:56 PM by jcm256
 01 December 2012 01:15 PM
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MrP

Posts: 832
Joined: 24 March 2006

I like the idea of a fire alarm siren being used each time someone comes to the front door everyone bolts for the fire exit
As others have said relays/contactors and your world is your lobster

MrP
 01 December 2012 01:29 PM
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Fm

Posts: 646
Joined: 24 August 2011

Maybe the intruder alarm has a chime function that operates every time the front door mag contact is opened?
 01 December 2012 01:34 PM
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Avatar for Legh.
Legh

Posts: 3472
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Lol, we were playing with a couple of 120dB sirens a few months back. They were loud !- .
Excellent for when you are at the bottom of the garden and someone rings at the door, also good for scaring off cold callers

Legh

-------------------------
Why do we need Vernier Calipers when we have container ships?

http://www.leghrichardson.co.uk

"Science has overcome time and space. Well, Harvey has overcome not only time and space - but any objections."
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