simple loop alarm for exhibits

[bernard towersParticipant @bernardtowers37738]

is there any kits or circuits available for a simple system, I just need to protect some items at an exhibition.

[bernard towersParticipant @bernardtowers37738]

[duncan webster 1Participant @duncanwebster1]

I made one years ago for our club. I've just sent a WhatsApp round to see if it can be found, if so you're welcome to borrow it.

[bernard towersParticipant @bernardtowers37738]

Cheers Duncan that coud be very helpful

[DalboyParticipant @dalboy]

Will THIS work

[bernard towersParticipant @bernardtowers37738]

Yes Dalboy this would be fine excepting my abilities in electronics and buying small quantities of components as I dont have an electronic scrap box, I had thought that a kit might be available as in the days of Maplins.

[Bo’sunParticipant @bosun58570]

Maplin. Halcyon days when shops sold useful things.

[John Doe 2Participant @johndoe2]

Another idea might be not to bother building a device with electronics/electrics, but just thread through everything a few meters of thin chain, cut in a couple of places and held together with small padlocks, assuming a thin chain would fit through all the items you have.

If not, maybe some thin rigging wire (not electrical cable), but that would not be as easy to secure and have removable breaks in the loop.

Very quick and simple to build – with items bought from a DIY store. And secure enough to prevent pilfering – or at least warn of an attempt happening. The chain with a padlock every couple of meters would enable items to be released quite easily and the chain then re-secured.

[Michael GilliganParticipant @michaelgilligan61133]

A quick & dirty solution would be to buy a ‘bag alarm’ as used for luggage, etc. … then attach your chain/wire/string/ whatever to the two parts of that.

MichaelG.

.

ferinstance … https://www.ebay.co.uk/itm/173316446734

Edited By Michael Gilligan on 30/09/2023 15:21:08

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, you should be able to get everything needed for the alarm that Dalboy has linked too from Cricklewood Electronics No need to dwell over the loss of Maplins, although they do have a website for online orders Maplin but I don't think they have as many components that they had in days past.

Regards Nick.

[DiogenesParticipant @diogenes]

Would a simple 'pull-the-pin' alarm do the job ? – used to have one of these on my shed door… ..cheap and easy to rig..

WalkEasy – Minder personal Attack Alarm

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Diogenes on 30/09/2023 16:24:07:

Would a simple 'pull-the-pin' alarm do the job ? .

I hope so … it’s very much like I suggested

MichaelG.

[Speedy Builder5Participant @speedybuilder5]

Electric fence like farmers use!

[duncan webster 1Participant @duncanwebster1]

It's been found, as soon as I have it in my hands and can check it still works I'll be in touch, probably middle of next week

[bernard towersParticipant @bernardtowers37738]

Thanks Duncan will wait to hear from you, the idea from Michael is a good one too

[bernard towersParticipant @bernardtowers37738]

deleted

Edited By bernard towers on 30/09/2023 20:18:21

[noel shelleyParticipant @noelshelley55608]

Battery and a relay ! Wire alarm to NC contact and Common back to battery. Wire coil to length of wire connected to battery and other coil terminal to battery. If the wire to the goodies is parted the coil drops and the alarm sounds. Relay coil to suit battery voltage. Noel.

[BazyleParticipant @bazyle]

You can make the equivalent of a pin pull out connection with a couple of drawing pins in the jaws of a wooden clothes peg and a bit of plastic to separate them.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Bazyle on 30/09/2023 22:48:18:

You can make the equivalent of a pin pull out connection with a couple of drawing pins in the jaws of a wooden clothes peg and a bit of plastic to separate them.

.

So then there’s only the battery and the alarm to find or make

MichaelG.

[Speedy Builder5Participant @speedybuilder5]

And do remember, if it can be easily removed (Loco safety valve domes , miniature spades etc), a loop wire does not protect. Perhaps a notice like "Video scanning in operation" may help.

[DiogenesParticipant @diogenes]

Posted by Michael Gilligan on 30/09/2023 16:32:49:

Posted by Diogenes on 30/09/2023 16:24:07:

Would a simple 'pull-the-pin' alarm do the job ? .

I hope so … it’s very much like I suggested

MichaelG.

..indeed – acknowledged..

[Michael GilliganParticipant @michaelgilligan61133]

very gracious of you.

MichaelG.

[JohnFParticipant @johnf59703]

Bernard, Something to be aware of with this type of security device is that if you have more than one junction in the loop wire its possible for remove an item from the loop without there being a warning if you have switched it off to remove an item for e.g. demonstration. The answer of course is reconnect asap whilst the demo takes place.

This is probably unlikely for your situation but I know of such an event happening at a show on a relatively large stand where for convenience they had several junctions in the said loop. We used to use these but stopped after this happening to the other vendor.

Forewarned is forearmed !

John

[Howard LewisParticipant @howardlewis46836]

Our club alarm is acontinuous wire loop, but if the loop is disconnected from the battery box, (connector removed or wire cut ) the alarm sounds.

So it sounds like it might be a switched socket, probably 3.5 mm, so that when the plug is inserted, the connection between the battery and the alarm is broken One side of the battery is connected permanently to the alarm, and the other side is fed through the jack plug to the loop where the far end s are joined.. The alarm wire does not actually carry nany current, but if it is broken in any way, the alarm is activated

HTH

Howard

[duncan webster 1Participant @duncanwebster1]

so if someone cuts the wire you won't know?

[Author]

Posts