[SOLVED] High-theft alarm circuit

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mo2_star

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Hello to all friends
i need a alarm circuit with very high voice
i want to use it in a Theft alarm for a store .

ThanKs.
 

mo2_star said:
Hello to all friends
i need a alarm circuit with very high voice
i want to use it in a Theft alarm for a store .

ThanKs.
Click to expand...

What is "high voice" ? You mean very loud ? or you want to break glass with high tones ?

For voice you need specialized IC which can store recorded voice. Good amplifier and good speakers will be responsible for volume.
 
you should use motorized siren from KHERAJ SIRENS and operate it with a relay.
these sirens are available in the range 2km, to 10 km. with very loud sound

Sirens - Kheraj Electrical Industries
**broken link removed**
 
yes my mean is very loud . I am sorry
Should be enough to neighbors can hear it .

- - - Updated - - -

captain251731 said:
you should use motorized siren from KHERAJ SIRENS and operate it with a relay.
these sirens are available in the range 2km, to 10 km. with very loud sound

Sirens - Kheraj Electrical Industries
**broken link removed**
Click to expand...
I can't use this because i can't find it in my country and Because we're in an economic boycott
 

You may need to be a little more specific about your requirements if you want any helpful replies. Do you want PIR , or is a door switch
/magnetic good enough. Are you going to build it yourself , or are you happy to buy?
Here are some starters:
https://www.kitronik.co.uk/products/project-kits/ic-based-kits/alarm-project-kit/
https://electroschematics.com/8425/led-security-light-with-pir-motion-sensor/
**broken link removed**

There are a ton of schematics out there for alarms. For a loud siren I'd use a piezo electric siren(sound bomb) , about as loud
as you get for a fairly cheap price , and they don't need a big power supply to get working.
Cheers
Neddie.
 
mo2_star said:
yes my mean is very loud . I am sorry
Should be enough to neighbors can hear it .

I can't use this because i can't find it in my country and Because we're in an economic boycott
Click to expand...


You can use compressed air trumpete for car, and beleive me I have this earlier, this weakup deads from graves. I remove this from car, because this is very dangerous for usage in city traffic. You need only to supply 12V to compressor and to switch button :

 
ThaNks my friends.
If I design a circuit alarm with a IC 555 and then I output it to a power amplifier
Can I get a loud sound output of the amplifier?
 

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