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UK source for this magnetic switch?

R

Ross Herbert

Jan 1, 1970
0
:On 2/7/2009 3:32 AM Terry Pinnell spake thus:
:
:> Can anyone point me towards a UK source (phone or online) for an
:> inexpensive cylindrical, enclosed reed switch, N/C, for use in a
:> burglar alarm circuit please.
:>
:> I'm still googling but so far without success and want to place an
:> order for delivery Monday.
:
:Sorry, I can't help, being in the US where things like this are
:trivially easy to get.

Have you been wondering why the OP has not bothered to respond to any of the
responses?

I would bet my last cent that he is a troll and many have been drawn to the
apparently innocent "come in sucker" question. Nobody is so dumb that he doesn't
know that such devices are readily available from any number of electronics
parts outlets. They are just as trivially easy to get in the UK as in the US.
For example, Maplin is well known to all electronics hobbyists...
http://www.maplin.co.uk/Module.aspx...Pages&doy=search&MenuName=Surface Reed Switch
and many others carry similar items.


:
:Just one thing: did someone here say that switches like this were
:typically N/O rather than N/C? And that such could be used for an alarm
:circuit?
:
:Think about it: if you have a N/O switch as an alarm sensor, all the bad
:guy has to do to get in is to cut it out of the circuit. There's a
:reason alarm switches are normally closed.
:
:Hard to believe a N/C reed switch wouldn't be easy to buy somewhere in
:England.
 
T

Trevor Wilson

Jan 1, 1970
0
Terry Pinnell said:
Can anyone point me towards a UK source (phone or online) for an
inexpensive cylindrical, enclosed reed switch, N/C, for use in a
burglar alarm circuit please.

I'm still googling but so far without success and want to place an
order for delivery Monday.

**Farnell.
 
D

David Nebenzahl

Jan 1, 1970
0
Have you been wondering why the OP has not bothered to respond to any
of the responses?

Busy? Distracted? Forgot about it?
I would bet my last cent that he is a troll and many have been drawn
to the apparently innocent "come in sucker" question. Nobody is so
dumb that he doesn't know that such devices are readily available
from any number of electronics parts outlets. They are just as
trivially easy to get in the UK as in the US.

Pretty polite and straightforward for a troll, if you ask me.

And maybe not dumb but ignorant instead. (One reason people ask
questions in the first place.)


--
Personally, I like Vista, but I probably won't use it. I like it
because it generates considerable business for me in consulting and
upgrades. As long as there is hardware and software out there that
doesn't work, I stay in business. Incidentally, my company motto is
"If this stuff worked, you wouldn't need me".

- lifted from sci.electronics.repair
 
R

Ross Herbert

Jan 1, 1970
0
:On Mon, 09 Feb 2009 08:59:21 GMT, Ross Herbert <[email protected]>
:wrote:
:
:>On Sun, 08 Feb 2009 20:01:18 -0800, David Nebenzahl <[email protected]>
:>wrote:
:>
:>:On 2/7/2009 3:32 AM Terry Pinnell spake thus:
:>:
:>:> Can anyone point me towards a UK source (phone or online) for an
:>:> inexpensive cylindrical, enclosed reed switch, N/C, for use in a
:>:> burglar alarm circuit please.
:>:>
:>:> I'm still googling but so far without success and want to place an
:>:> order for delivery Monday.
:>:
:>:Sorry, I can't help, being in the US where things like this are
:>:trivially easy to get.
:>
:>Have you been wondering why the OP has not bothered to respond to any of the
:>responses?
:>
:>I would bet my last cent that he is a troll and many have been drawn to the
:>apparently innocent "come in sucker" question.
:
:---
:And you'd lose.

I'm not so sure about that. While there are many replies from others there is
not one which points to a supply source. So where is there a response from him
to indicate he requires further clarification or assistance? To request help and
then not respond is just plain rude in my book. Even something letting people
know he was interested in their answers would be nice.

:
:Terry hasn't been around for a while, but when he was a regular his
:posts were always interesting and his demeanor always polite.

Unlike yourself as we can see from your final epithet in this response of yours.

:---
:
:> Nobody is so dumb that he doesn't
:>know that such devices are readily available from any number of electronics
:>parts outlets.
:
:---
:It's not so much about being dumb as it is about not knowing something
:and asking for help.

The term "dumb" was meant to convey "ignorance". And ignorance in this case as
to how to find the part he was looking for. He states in his request that he
knows the part is used in burglar alarms and that it is a reed switch which can
be operated by a magnet. Now anybody with a modicum of intelligence in using
Google can combine 2 of these facts into a search term. For example;
burglar+alarm+reed+switch. And if he was aware of Google's ability to search
within a locale he would add uk at the end to get results for his country. To be
completely correct for a locale search the term would be site:.uk

:---
:
:>They are just as trivially easy to get in the UK as in the US.
:>For example, Maplin is well known to all electronics hobbyists...
:>http://www.maplin.co.uk/Module.aspx...Pages&doy=search&MenuName=Surface Reed Switch
:>and many others carry similar items.
:
:---
:So, instead of just posting the link, (which would have been helpful)
:you accompany it with a slap, which does nothing but start trouble.
:
:**** you.
:
:JF

John, you have just compounded the situation with your gratuitous and uncalled
for FU compliment.

I was not intending to deliver a slap along with the helpful link, but simply to
prompt the OP to respond in some manner. You took that responsibility for
yourself instead of letting him do so.

If the OP has been following the thread which he started in the hope of getting
help (why would he have posted if not to follow and read answers?) then why has
he not responded with some sort of indication that he requires further
clarification or that he welcomes the suggestions? That is tantamount to
"trolling" in my opinion.
 
S

sirkituk

Jan 1, 1970
0
Can anyone point me towards a UK source (phone or online) for an
inexpensive cylindrical, enclosed reed switch, N/C, for use in a
burglar alarm circuit please.

I'm still googling but so far without success and want to place an
order for delivery Monday.

If you are still having problems contact me.
regards
Ed
 
T

Terry Pinnell

Jan 1, 1970
0
Nobody said:
Phil Allison said:


IOW, it's a question of how you define "normally".

Reed switches are open in the absence of a magnetic field, and closed when
one is present.

For a relay, you would call such contacts "normally open".

But for a burglar alarm, the "normal" situation is for the magnetic field
to be present, from a permanent magnet in a door or window which is
"normally" adjacent to the reed switch. In this situation, the contacts
will be held closed.

Thanks for the responses and my apologies for not responding sooner.

Yes, as many have pointed out, I was mistaken about the N/C
requirement. It was indeed the ambiguity over the meaning of 'normally
open' that caused my mistake. I'd forgotten that the accompanying
magnet normally(!) kept it closed. IOW I was regarding 'normality' as
the state when my doors are closed, not when the potential burglar was
gaining access ;-)

I did realise my mistake soon after posting and duly ordered a few
from Rapid Electronics
http://www.rapidonline.com/Electron...ty-Magnetic/Proximity-switch/65354/kw/78-0797
 
T

Terry Pinnell

Jan 1, 1970
0
sirkituk said:
If you are still having problems contact me.
regards
Ed

Thanks Ed, sorted thanks. (See my post of a few hours ago.)
 
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