Making Led Flash On Alarm Bell Box

[dbaplaya]

ive got a texecom odessy 5e bell box - any way i can make the internal led's flash using a battery?
The box is real but i havent got an alarm on the house.

 

[PrenticeBoyofDerry]

You can buy a unit that will do this for about £20.00 that has battery life of about 10 years.
I will try get a link to one.

Something like this
http://www.amazon.co.uk/FLASHING-ALARM-DUMMY-LIFETIME-GUARANTEE/dp/B00F2O7ON0

 

[dbaplaya]

just tried a 9v battery on it and it flashes but unsure how long that would last

 

[PrenticeBoyofDerry]

just tried a 9v battery on it and it flashes but unsure how long that would last

probably a couple of weeks

 

[sparkymarka]

12v power supply

 

[EightyTwo]

The Amazon flasher is cheap and easy. I used to make something similar with a LM3909 but I don't think I'd bother now! You can get a 12V 1A psu for a fiver and wire it up but you'll need to drill holes through your wall... Also, when you have a powercut, the bell will go off.

 

[sparkymarka]

You take out the sounder wires !

 

[bernardgreen]

Use a self flashing LED and a 4.5 volt battery

http://www.rapidonline.com/electronic-components/truopto-ospb5x31a-5mm-5v-blue-flashing-led-55-1898

data sheet http://www.rapidonline.com/pdf/55-1898.pdf

Other options here

http://www.rapidonline.com/Search?query=flashing&filterSearchScope=0

There are other suppliers of similar items

 

[EightyTwo]

Bernard, you'll need a big battery for the 10mA current drain - 88Ahr for the year?!!

 

[Mikefromlondon]

If you make your own flashing circuit using a CMOS nand gate (4011) and use a high efficiency Blue LED and make it flash every two seconds for a very brief period, a 9v Alkaline battery should last you a whole year, and if you also add a jewl thief to the output of it it will last much longer.

You could also use a CMOS version of the astable 555 timer.

 

[bernardgreen]

Bernard, you'll need a big battery for the 10mA current drain - 88Ahr for the year?!!

I like BIG batteries.........

But yes it would require battery changes every few weeks. For the limited effect as a deterant is it worth the effort to have dummy bell boxes. ( or real ones with no alarm )

 

[Europlex]

Oh, get one from eBay and 'go with the flow'

 

[iwest]

If you can run a wire inside connect to a 12v power supply (an old phone charger or something of the right voltage/current rating) or a 12v car or motorbike battery, then snip one of the wires to the piezo sounder.

 

[secureiam]

with sparkymarka 12V power supply, if the unit is tampered with or there's a power cut the bell will sound.

if the jumper on the bell is set for the internal battery that is.