How can I make a phone ring ridiculously loud ?
Paul-S
I have a phone at work (where it's noisy) and if I move about 15 feet
way I can't hear the bloody thing ringing.
What I'd like to do, is put a double adaptor into the phone socket,
and make something (mains powered) that makes an incredibly stupidly
loud noise when the phone rings :-)
Anyone got some thoughts ?
I've seen some small pizo electic sirens in maplins that make about
115 db when they're active, but I've no idea how to get anything like
this made up.
Note, it's for work, and I'm paying, so gotta be done on the cheap!
Paul.
nightjar
Paul-S wrote in message <36ae4d98...@news.u-net.com>...
>How can I make a phone ring ridiculously loud ?
>
>I have a phone at work (where it's noisy) and if I move about 15 feet
>way I can't hear the bloody thing ringing.
If your workplace is that noisy I would first check it with a noise
meter. If the level exceeds 90dB (A), there is a legal requirement for
hearing protection. If it exceeds 85dB (A), hearing protection is
advisable.
>
>What I'd like to do, is put a double adaptor into the phone socket,
>and make something (mains powered) that makes an incredibly stupidly
>loud noise when the phone rings :-)
BT do a noisy environment telephone bell, which you should be able to
get from a BT shop. I think they come in two levels of loudness to suit
most environments.
Colin Bignell
Charles (Joe) Stahelin
net.com> writes
>How can I make a phone ring ridiculously loud ?
>
>I have a phone at work (where it's noisy) and if I move about 15 feet
>way I can't hear the bloody thing ringing.
BT sell a loud ringing device at something like ten pounds if my memory
serves aright. These are connected into the phone socket by the use of
a "splitter" which fits into the existing phone socket and provides two
outlets: one for the phone and one for the ringer. There can be
problems if the instrument loading on the line exceeds four 'Rens' but
how this works out on PBX extensions and the like I do not know. If
you are using a direct BT line with its own number there will be no
problem. If you do not understand the complications ring the BT
operator and ask to be put through to someone who can advise you. The
loud ringers I refer to are not to be confused with the little two inch
by two inch items you see in non-specialist places like DIY superstores.
Written on the base of mine is Item Code 870506 and A6X
S/3861/8/N/502392. Being slightly deaf I have one of these attached to
each extension in the house/workshop and have to use an additional
device costing about 35 pounds to increase the 'Ren' capacity of the
line.
--
Charles (Joe) Stahelin,
Huddersfield, West Yorkshire, UK.
Andrew Gabriel
pa...@gremlin.u-net.com (Paul-S) writes:
>How can I make a phone ring ridiculously loud ?
>
>I have a phone at work (where it's noisy) and if I move about 15 feet
>way I can't hear the bloody thing ringing.
I would say your workplace is too noisy.
You could also try asking in uk.telecom and uk.people.deaf
(crossposted), who may know of some suitable obscure products
besides the regular extra plug-in sounders.
How about a cordless phone you carry with you?
--
Andrew Gabriel
Consultant Software Engineer
Frank Erskine
<nigh...@pavilion.co.uk> writes
>>
>>I have a phone at work (where it's noisy) and if I move about 15 feet
>>way I can't hear the bloody thing ringing.
>
>meter. If the level exceeds 90dB (A), there is a legal requirement for
>hearing protection. If it exceeds 85dB (A), hearing protection is
>advisable.
>
>>
>>What I'd like to do, is put a double adaptor into the phone socket,
>>and make something (mains powered) that makes an incredibly stupidly
>>loud noise when the phone rings :-)
>
>BT do a noisy environment telephone bell, which you should be able to
>get from a BT shop. I think they come in two levels of loudness to suit
>most environments.
>
switch which you could use to operate almost anything you cared to use
such as a bell, hooter, etc - even flashing lights if you really wanted.
It might be worth asking if they're still available.
How you cope with the noise when you actually pick up the phone is
another matter :-)
--
Frank Erskine
Sunderland
Don't go metric - feet, BSF, Whitworth and inches are miles better
Still looking for 67.5V and 100V HT batteries
Allan McVie
the phone line.
However you can get this type of thing from RS ,Maplin, BT etc
even ones with flashing lights
Allan
Maximum Adrian
article <78migk$1...@cucumber.demon.co.uk>...
> You could also try asking in uk.telecom and
uk.people.deaf
> (crossposted), who may know of some suitable obscure
products
> besides the regular extra plug-in sounders.
i have a strobe light which flashes when calls come in -
from Nimans 0990 308 308.
--
Maximum Adrian
Jon Rouse
Mungo Henning
>
> Firstly anything you made yourself could not be directly connected to
> the phone line.
Methinks he meant "should" instead of "could" - I'd trust my own
devices connected to the BT network miles before someone else's
botch job of "extension wiring".
>
> However you can get this type of thing from RS ,Maplin, BT etc
> even ones with flashing lights
Agreed. IIRC you can buy telephones which have an integral light for
these situations.
Mungo
james winsoar
Andrew Gabriel <and...@cucumber.demon.co.uk> wrote in message
news:78migk$1...@cucumber.demon.co.uk...
>>
>>way I can't hear the bloody thing ringing.
BT sell an extremely loud ringer for that purpose.
--
james winsoar - smi
phone 07050 600626 fax 07050 642526 mobile 07957 627026
take calls throughout the uk, europe and usa
http://www.smi-group.co.uk/07005-europe.html
smi are leaders in personal numbering
47HQ-RSM6
<fr...@g3wte.demon.co.uk> writes
>>
>In fact at one time BT (it was the PO then!) used to provide a mercury
>switch which you could use to operate almost anything you cared to use
>such as a bell, hooter, etc - even flashing lights if you really wanted.
>
BT - but the devices all had to be adjusted as the ringing voltage at
the exchange had been turned down in some areas [from 80v to 50-60v AC]
due to mechanical bells being replaced by electronic callers.
IIRC the loud extension bell is actually called a "Loud Bell, Type 50"
or such like. There is also an even louder device called a "Bedlam Tone
Caller" which can make up to 105dbA of racket, which should be enough
noise for anyone :)
Alex
--
Regional Seat of Misrule 6 [RSM6] READINGSTOKE, GB.
http://www.rsm6.demon.co.uk
If replying by e-mail replace "nospam" with "rsm6"
Pour répondre par e-mail, remplacez "nospam" par "rsm6"
Marcus Sharma
Andrew Gabriel <and...@cucumber.demon.co.uk> wrote in message
news:78migk$1...@cucumber.demon.co.uk...
|In article <36ae4d98...@news.u-net.com>,
| pa...@gremlin.u-net.com (Paul-S) writes:
|>How can I make a phone ring ridiculously loud ?
|>
|>I have a phone at work (where it's noisy) and if I move about 15 feet
|>way I can't hear the bloody thing ringing.
|
|
|(crossposted), who may know of some suitable obscure products
|besides the regular extra plug-in sounders.
|
One place I worked at (engineering) had a unit which clipped onto the side
of the phone and was attached to a long cable with a mounted strobe light
(magnetic base).
There was a portable pager type device which vibrated in your pocket when
the phone rang also.
I think it was made by Binatone or Betacom or such like.
--
Marcus
ICQ #: 26770150
Note: Remove anti-spam '*'s from return address to reply.
Paul-S
<nigh...@pavilion.co.uk> wrote:
>If your workplace is that noisy I would first check it with a noise
>meter. If the level exceeds 90dB (A), there is a legal requirement for
>hearing protection. If it exceeds 85dB (A), hearing protection is
>advisable.
>
I wear earplugs anyway (which does not help in hearing the phone in
the first place)
>BT do a noisy environment telephone bell, which you should be able to
>get from a BT shop. I think they come in two levels of loudness to suit
>most environments.
>
Thank's
Paul.
Paul-S
Gabriel) wrote:
>I would say your workplace is too noisy.
>
Well, a bit noisy yes, but I also wear earplugs, which makes it harder
to hear the phone in the first place.
>You could also try asking in uk.telecom and uk.people.deaf
>(crossposted), who may know of some suitable obscure products
>besides the regular extra plug-in sounders.
>
>How about a cordless phone you carry with you?
It took 3 months to get this one, let alone a cordless !
I don't use it much at all, just want to hear it when it does ring.
Paul.
Derek Hornby
will not be loud for others.
Derek
"james winsoar" <ad...@smi-group.co.uk> writes:
>
>
> Andrew Gabriel <and...@cucumber.demon.co.uk> wrote in message
> news:78migk$1...@cucumber.demon.co.uk...
> >In article <36ae4d98...@news.u-net.com>,
> > pa...@gremlin.u-net.com (Paul-S) writes:
> >>How can I make a phone ring ridiculously loud ?
> >>
> >>I have a phone at work (where it's noisy) and if I move about 15 feet
> >>way I can't hear the bloody thing ringing.
>
Lyndon Thomas
<max...@dreamsfaithfully.com> writes
>i have a strobe light which flashes when calls come in -
>from Nimans 0990 308 308.
metres or so, and it starts vibrating. The transmitter just plugs
straight in to the phone line. I use the same device to warn me if the
fire alarm goes off as well, There is a transmitter alongside the fire
alarm - no connection necessary.
--
Lyndon Thomas
M.J.Powell
>> >>way I can't hear the bloody thing ringing.
>>
>> BT sell an extremely loud ringer for that purpose.
Farming friends of mine have a very bright light, fixed to the wall of
their farmhouse, which flashes with each call.
Mike
>>
Nick Croome
<max...@dreamsfaithfully.com> wrote:
<snip>
>i have a strobe light which flashes when calls come in -
>from Nimans 0990 308 308.
Try an AUDIOLINE TELEFLASH1.
A ridiculously loud ringer combined with a stobe light.
Triggered by a vibration sensor which can be attached to any vibrating
source such as telephone. My neighbour works shifts so I have to
switch off for fear of disturbing him!
--
Nick
Trebor_J
Simple install,
all you need is a 105 V relay that will close when ringing voltage hits it.
Strategically placed it will successfully fertile the shorts of a bystander
at 50'
You can get them from Graybar electric. Or Alltel
Hope that helps..
Trebor_J
Telecommunications Eng..
Siemens I,C,N USA
hiw...@ix.netcom.com
www.Magnitude9.com
Nick Croome wrote in message <36af9e8b...@news.clara.net>...
Ken Redman
> Simple install,
> all you need is a 105 V relay that will close when ringing voltage hits it.
>
BT will certainly have something to say about subscribers who connect
diy electronics to their phone lines! :-(
--
Ken Redman
Antispam: remove dot.
Kevin Poole
Trebor_J wrote in message <78opqi$m...@sjx-ixn10.ix.netcom.com>...
>How about a claxton horn ?
Ah, the hybrid one that screeches then prints a message
__
Kevin Poole
Mungo Henning
> So how do you know whether to evacuate the building or answer the
> phone?
> [/Silly question]
>
[Silly reply]
Depends which pocket it's in...
[/Silly reply]
Mungo :-)
Cos it's strange, isn't it. You stand in the middle of a library and go
'Aaaaaaagghhhh!' and everyone just stares at you. But you do the same
thing on an aeroplane, and everyone joins in.
Andrew Le Prevost
You can get a thing which plugs into the mains and acts as a relay in that
when the phone rings it turns the mains power on and off. All you do is
plug a light into it and leave it switched on. You could stick anything be
it a light or a siren etc.etc.
Andy.
and...@leprevost.net
James Lanng
>> all you need is a 105 V relay that will close when ringing voltage hits it.
>>
>
>BT will certainly have something to say about subscribers who connect
>diy electronics to their phone lines! :-(
Who cares?
James Lanng
<mi...@pickmere.demon.co.uk> wrote:
>>> >>I have a phone at work (where it's noisy) and if I move about 15 feet
>>> >>way I can't hear the bloody thing ringing.
>>>
>>> BT sell an extremely loud ringer for that purpose.
>
>Farming friends of mine have a very bright light, fixed to the wall of
>their farmhouse, which flashes with each call.
What - all of them?
Dave Plowman
Prevost" <and...@leprevost.net> wrote:
>
> You can get a thing which plugs into the mains and acts as a relay in that
> when the phone rings it turns the mains power on and off.
Supplier, please?
--
Dave Plowman dave....@argonet.co.uk
RIP Acorn
Ken Redman
> Who cares?
Note the organisation! I'm paid to care (in theory...)
--
Ken Redman
Antispam: To reply remove dot. from email address
Frank Erskine
james...@ibm.net> writes
A BT engineer might care if he's standing in a flooded manhole working
on your line, which just happens to be carrying mains voltage from your
non-type-approved power supply.
--
Frank Erskine
Sunderland
Alan
devices available from BT.
1. An extra loud one caller (a deaf person usually can get it fitted free)
2. A Ring-extender which increases the voltage to all the phones
subsequently connected to it. It allows a considerable increase in REN
factor. I am currently forking in my home with a REN factor of 13.5 instead
of the normal max of 4. It also increases the volume of the ring as well -
sufficiently so that hearing people jump!
If you phone has one of those devices which allows you to reduce the volume
by moving a lever which moves a disc over the tone sounder then you can snap
it off and placing it on a hard surface considerably increases the range!
Alan
Frank Erskine <fr...@g3wte.demon.co.uk> wrote in message
news:ltw1bNA2...@g3wte.demon.co.uk...
Trebor_J
Ken Redman wrote in message <36B025...@hotmail.dot.com>...
>Trebor_J wrote:
>> Simple install,
>> all you need is a 105 V relay that will close when ringing voltage hits
it.
>>
>
>BT will certainly have something to say about subscribers who connect
>diy electronics to their phone lines! :-(
>
Charles Ellson
nospam-ja...@ibm.net "James Lanng" writes:
> >> Simple install,
> >> all you need is a 105 V relay that will close when ringing voltage hits it.
> >>
> >
> >BT will certainly have something to say about subscribers who connect
> >diy electronics to their phone lines! :-(
>
> Who cares?
>
You will, if you were to do it and it went wrong, resulting in a
manslaughter/culpable homicide charge.
--
_______
+---------------------------------------------------+ |\\ //|
| Charles Ellson:E-mail charlesATellson.demon.co.uk | | \\ // |
+---------------------------------------------------+ | > < |
| // \\ |
Alba gu brath |//___\\|
Ken Redman
> IM in the states no biggie here. If its grounded correctly your fine anyway.
Yeah, but since this is the UK.DIY newsgroup, the answers tend to relate
to UK regs!
Andrew Le Prevost
> IM in the states no biggie here. If its grounded correctly your fine
anyway.
>
> >> all you need is a 105 V relay that will close when ringing voltage
hits
> it.
> >>
> >BT will certainly have something to say about subscribers who connect
> >diy electronics to their phone lines! :-(
From the CPC online Catalogue:
==========
Telephone Accessories
Call Alert by WHITELEY ELECTRONICS
A device designed to switch AC and/or DC devices when a ringing voltage is
detected from a PABX, telephone
network or any standard UK telephone point. The 'Call Alert' can provide
visual or audible indication of an
incoming call by switching on lamps, bells, beacons or sirens and is
ideally suited to noisy environments or in
rooms where there are no telephones.
Optical isolation between the telephone network and the output
Flame retardant, wall mounting enclosure
Precautionary barrier prevents cross-wiring between telephone and
AC/DC circuits
REN 0.6 and suitable for operating in parallel with telephones
Technical Data
Ringing Detection 23V-95V, 17-25Hz
Isolation 10kV
Load 5A max.
Output Rating AC DC 7-250V ac/5A 4-60V dc/1A
Order Code DP26074
Price £88.29
Picture at:
https://catalogue.cpc.co.uk:443/cpc/assets/images/CPCImages/DP26074-01.jpg
==========
Andy.
and...@leprevost.net
Jon Rouse
<36b081c5...@news.demon.co.uk>...
> >> Simple install,
> >> all you need is a 105 V relay that will close when ringing voltage
hits it.
> >>
> >
> >BT will certainly have something to say about subscribers who connect
> >diy electronics to their phone lines! :-(
>
>
Your wife and family might when they're out on the street as a result of
your having been sued for every penny you have by the widow of the BT
technician you kill, and put in jail for manslaughter.
People up to their ankles in manholes full of muddy water do not expect
240v appearing on the cabling.
and...@newtonsols.net
> You will, if you were to do it and it went wrong, resulting in a
> manslaughter/culpable homicide charge.
You will, no doubt, be able cite an example of this happening to someone in
this country?
--
Andrew Crawford newton solutions ltd
+44 1883 626244 the net knows everything
and...@newtonsols.net
> your having been sued for every penny you have by the widow of the BT
> technician you kill, and put in jail for manslaughter.
Except that what you describe is entirely hypothetical as there has never
been such a case in the UK. Of course, you may know better.. if so, please
enlighten us :)
Beaver
<Cha...@ellson.demon.co.uk> writes
>> >> all you need is a 105 V relay that will close when ringing voltage hits it.
>> >>
>> >
>> >BT will certainly have something to say about subscribers who connect
>> >diy electronics to their phone lines! :-(
>>
>> Who cares?
>>
>manslaughter/culpable homicide charge.
Charles is correct. B.T engineers tend to become a little irritated if
they are electrocuted.
Mar sin leat,
Ruairidh Beaver.
--
Beaver
Frank Erskine
writes
>> Your wife and family might when they're out on the street as a result of
>> your having been sued for every penny you have by the widow of the BT
>> technician you kill, and put in jail for manslaughter.
>
>Except that what you describe is entirely hypothetical as there has never
>been such a case in the UK. Of course, you may know better.. if so, please
>enlighten us :)
>
you're banned from using your favourite gadget "on line"?
Are you really prepared to defend such a case?
--
Frank Erskine
Sunderland
Trebor_J
Charles Ellson wrote in message <917588...@ellson.demon.co.uk>...
>In article <36b081c5...@news.demon.co.uk>
> nospam-ja...@ibm.net "James Lanng" writes:
>
>> >> Simple install,
>> >> all you need is a 105 V relay that will close when ringing voltage
hits it.
>> >>
>> >
>> >BT will certainly have something to say about subscribers who connect
>> >diy electronics to their phone lines! :-(
>>
>> Who cares?
>>
>You will, if you were to do it and it went wrong, resulting in a
>manslaughter/culpable homicide charge.
Trebor_J
Keep this in mind.
If wired correctly. NO one will get fried..
Relays DO NOT send voltage on the line.
they send voltage to the device that RINGS.
If simple instructions are followed
no one gets hurt.
Jon Rouse wrote in message <01be4b6d$ec241a20$5f585790@itmo15485>...
>James Lanng <nospam-ja...@ibm.net> wrote in article
><36b081c5...@news.demon.co.uk>...
>> >> Simple install,
>> >> all you need is a 105 V relay that will close when ringing voltage
>hits it.
>> >>
>> >
>> >BT will certainly have something to say about subscribers who connect
>> >diy electronics to their phone lines! :-(
>>
>> Who cares?
>>
>
>Your wife and family might when they're out on the street as a result of
>your having been sued for every penny you have by the widow of the BT
>technician you kill, and put in jail for manslaughter.
>
Charles Ellson
> In uk.telecom Charles Ellson <Cha...@ellson.demon.co.uk> wrote:
> > You will, if you were to do it and it went wrong, resulting in a
> > manslaughter/culpable homicide charge.
>
> You will, no doubt, be able cite an example of this happening to someone in
> this country?
>
No precise cases, but ISTR at least two prosecutions in recent years
involving deaths caused by unauthorised persons carrying out DIY work on
domestic gas installations.
Dave Plowman
<fr...@g3wte.demon.co.uk> wrote:
> >
> Are you seriously suggesting that somebody should be killed before
> you're banned from using your favourite gadget "on line"?
>
> Are you really prepared to defend such a case?
You are, of course, begging the question that it's impossible for a 'non
approved' device to be correctly engineered for direct connection to the
telephone system. This is not just a safety consideration but commercial.
It's not many years back when the GPO would only allow their own telephones
to be used, with a ridiculous hire charge.
Andy Smith
<Hiw...@ix.netcom.com> wrote:
>IM in the states no biggie here. If its grounded correctly your fine anyway.
If your electronics is as good as your spelling I'm not sure I'm safe even
here.
--
Andy J. Smith ... <an...@mythic.net> ... <http://www.strugglers.net/andy>
Mail to andy...@mythic.net for PGP Key, or check the key servers ......
KeyID: 0xBF15490B FP: 0E42 36CB 5295 1E14 5360 6622 2099 B64C BF15 490B
"Some mornings, it's just not worth chewing through the leather straps."
-- Emo Phillips
Frank Erskine
<dave....@argonet.co.uk> writes
>In article <HUWt1IAv...@g3wte.demon.co.uk>, Frank Erskine
><fr...@g3wte.demon.co.uk> wrote:
>> >
>> Are you seriously suggesting that somebody should be killed before
>> you're banned from using your favourite gadget "on line"?
>>
>> Are you really prepared to defend such a case?
>
> You are, of course, begging the question that it's impossible for a 'non
>approved' device to be correctly engineered for direct connection to the
>telephone system.
My point being that if there isn't some form of type-approval, EVERYBODY
would consider their little gizmos to be "correctly engineered".
Regards -
--
Frank Erskine
Sunderland
Don't go metric - furlongs, BSF, Whitworth and inches are miles better
Andrew Gabriel
Dave Plowman <dave....@argonet.co.uk> writes:
>In article <HUWt1IAv...@g3wte.demon.co.uk>, Frank Erskine
><fr...@g3wte.demon.co.uk> wrote:
>> >
>> Are you seriously suggesting that somebody should be killed before
>> you're banned from using your favourite gadget "on line"?
>>
>> Are you really prepared to defend such a case?
>
> You are, of course, begging the question that it's impossible for a 'non
>approved' device to be correctly engineered for direct connection to the
There are issues other than safety certainly. I read somewhere
recently that Oftel is worried about ADSL interfering with other
subscribers lines - clearly it's possible for you to inject
signals which would interfere with other subscribers calls.
There certainly have been cases of subscribers blowing up their
line card in the exchange concentrator - I don't know if BT
charged them for the replacement, but that would leave you heavily
out of pocket - such things are not cheap (each card does many
lines).
BTW, please remove uk.people.deaf from followups; this thread
long-since drifted off-topic for that newsgroup.
(I resisted the temptation to add uk.people.dead :-)
--
Andrew Gabriel
Consultant Software Engineer
Simon Watkins
> approved' device to be correctly engineered for direct connection to the
> telephone system. This is not just a safety consideration but commercial.
> to be used, with a ridiculous hire charge.
Maybe you think that everyone should be allowed to connect whatever they wish
tothe PSTN ? I've heard a few people complain that BABT approval is just
comemrcial,
but anyone who knows the slightest thing about the PSTN will know that this
accusation
cannot be levelled at BABT with respect to safety issues.
What else would you have them do for goodness sake ? Would you prefer to see it
policed by itigation after an incident ?
Simon
Simon Watkins
> To all those who are worried about the pore bastard sizzling like bacon,
> Keep this in mind.
> If wired correctly. NO one will get fried..
> Relays DO NOT send voltage on the line.
> they send voltage to the device that RINGS.
> If simple instructions are followed
> no one gets hurt.
>
If you involve human beings, then you have to be prepared for people to mess
up.
There are numerous examples of dangerous and incorrect wiring performed by
people
who should not be allowed anywhere near electrical appliances.
One particular example springs to mind: My brother in-law worked in a hosipal
where a nurse didn't know what to do with an unconnected wire she noticed
coming
out from a baby's incumbator. She thus decided to wire a three pin plug to
it, and plugged
it in a wall socket. The baby was hurt, but thankfully not seriously.
Never underestimate the capacity out there for stupidity.
Simon
Brian
engineer in the City of London , we had a customer repeatedly alarming out
all of their lines. On investigation they were using/plugging in equipment
which was sending low amperage 240v back down all their lines.
Needless to say the lines were 'busied out' & the customer informed that
service would be resumed as soon as they stopped using the equipment causing
the problem (I never found out what the equipment was).
So it does happen. Thankfully, in this case, no one was hurt but I'm sure
that if you investigated fully they would be cases where people were. Why
else would the first copper pair test, a field engineer is supposed to do,
is to check for excessive ac voltages.
TTFN
B-)
Zefram Cochrane
>If wired correctly. NO one will get fried..
>Relays DO NOT send voltage on the line.
Yes they do. It's called "flux breakdown", "self-induction", "back EMF" and
a few other things. When something (such as a ringing voltage) drives a
relay
and the voltage source disappears, a much larger voltage appears (backwards)
across the relay coil. If this is connected to the line, then that voltage
will be transmitted to the line. It's at a very low current though, and
only lasts for a few ms or whatever.
Richard [in PE12]
Lyndon Thomas
<sim...@cableol.co.uk> writes
>One particular example springs to mind: My brother in-law worked in a hosipal
>
>where a nurse didn't know what to do with an unconnected wire she noticed
>coming
>out from a baby's incumbator. She thus decided to wire a three pin plug to
>it, and plugged
>it in a wall socket. The baby was hurt, but thankfully not seriously.
>Never underestimate the capacity out there for stupidity.
--
Lyndon Thomas
Simon Watkins
They don't. In Cardiff Royal Infirmiry it's a well known incident.
Simon
Dave Plowman
<19sca.r...@dial.pipex.com> wrote:
>
> Yes they do. It's called "flux breakdown", "self-induction", "back EMF"
> and
> a few other things. When something (such as a ringing voltage) drives a
> relay
> and the voltage source disappears, a much larger voltage appears
> (backwards)
> across the relay coil. If this is connected to the line, then that voltage
> will be transmitted to the line. It's at a very low current though, and
> only lasts for a few ms or whatever.
So they never used electro magnetic bells because of this?
DSL
Fortunately for me (and the tosser who's line it was) I was using new, well
insulated cutters.
We (BT engineers) are supposed to check for unusual voltage before working
on the line ....
Just my bit
Dave
Simon Watkins
> >been such a case in the UK. Of course, you may know better.. if so, please
> >enlighten us :)
Of course it has. There are many and varied cases of mains voltage appearing on
telecom networks.
It is something that operators of telecom networks must be eternally vigilant
against -
hence the strict rules of approved equipment.
So you obviously think that all of this is unnecesssary and people hsould just
connect
whatever they wish ?
Simon
Dave J.
Nice high impedance ones.
Possibly with a capacitor to kill the back emf?
D.J.
Matthew Marks
Cha...@ellson.demon.co.uk (Charles Ellson) writes:
> No precise cases, but ISTR at least two prosecutions in recent years
> involving deaths caused by unauthorised persons carrying out DIY work on
> domestic gas installations.
And what has that got to do with telephone cables?
--
Matthew @rd.bbc.co.uk My opinions, not Auntie's
Elaine Howe
it has loud speakers on it and rings really loud, speak to your works health
and safety about reasonable adjustments to the work place and then they will
get you the special phone
Andrew Gabriel wrote in message <78migk$1...@cucumber.demon.co.uk>...
>In article <36ae4d98...@news.u-net.com>,
> pa...@gremlin.u-net.com (Paul-S) writes:
>>How can I make a phone ring ridiculously loud ?
>>
>>I have a phone at work (where it's noisy) and if I move about 15 feet
>>way I can't hear the bloody thing ringing.
>
>I would say your workplace is too noisy.
>
>You could also try asking in uk.telecom and uk.people.deaf
>(crossposted), who may know of some suitable obscure products
>besides the regular extra plug-in sounders.
>
>How about a cordless phone you carry with you?
Tim Dean
tim
--
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| | (_| | __/ (_| | | | |
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... I forgot my tagline file...
Dave Plowman
Matthew Marks
Trebor_J
we would never progress.
Our society dictates that we produce bigger & better bells & whistles.
This of course comes with the standard occupational hazards of the industry.
We can only provide warnings for these devices. If an individual decides to
ignore them then it is at his or her own peril.
We cannot fix Stupidity
We can only provide information to those that are willing to listen.
Simon Watkins wrote in message <36B30F1B...@cableol.co.uk>...
>Trebor_J wrote:
>
>> To all those who are worried about the pore bastard sizzling like bacon,
>> Keep this in mind.
>> If wired correctly. NO one will get fried..
>> Relays DO NOT send voltage on the line.
>> they send voltage to the device that RINGS.
>> If simple instructions are followed
>> no one gets hurt.
>>
>
>If you involve human beings, then you have to be prepared for people to
mess
>up.
>There are numerous examples of dangerous and incorrect wiring performed by
>people
>who should not be allowed anywhere near electrical appliances.
>One particular example springs to mind: My brother in-law worked in a
hosipal
>
>where a nurse didn't know what to do with an unconnected wire she noticed
>coming
>out from a baby's incumbator. She thus decided to wire a three pin plug to
>it, and plugged
>it in a wall socket. The baby was hurt, but thankfully not seriously.
>Never underestimate the capacity out there for stupidity.
>
>Simon
>
Bill Coffel
wrote:
I have some (US) telephone manuals, from early in the century, that
advise a telephone repairman to taste the wire to determine if is
connected to the central office supply. 48volts DC talk, 90V AC ring
was expected, imagine the surprise when shorted to a high tension
power line.
>
>TTFN
>
>B-)
>
>