Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Mechanical & Electrical

SFT Search:   
Thread Tools Display Modes
Old 05-08-2018, 07:31 PM
RED caddy's Avatar
RED caddy RED caddy is offline
Da Chief
Join Date: Aug 2004
Location: Venice, Florida
Posts: 5,373
Default intruder alarm system help

OK, design time again.

The problem: I need to alarm my shop as I will be away for short periods, up to 3 weeks at a time.

What I need is some design and material help. I think I want to build a very load 150+ DB low freq horn. The kind that makes it impossible to remain in the building. Controlled by a battery (12 VDC battery) magnetic door switches and motion detectors.

When triggered, I want it to run for a short time,(30 to 60 seconds ?) stop and reset, also lite up SWMBO's smart phone. to let me know the building was breached. (I'll call the sheriffs or my neighbor to check)

The idea is to make the would be thief leave the building (filling his pants, if possible. I have been told that very low frequencies, at a very high volume, can have that effect.

Flashing bright strobe lights are also a desirable add on.

The idea is to run off anybody dumb enough to break in, without annoying the neighbors all night.

Any help or ideas are most welcome.

Thanks, RED
A 160 MPH drive, down a 2 lane blacktop, all by yourself, is NOT anti-social behaviour... I drag race because football, baseball, and golf only need ONE ball. Paul.

What I really need to know is, WHEN DOES THE SHOOTING START?
Reply With Quote
Old 05-08-2018, 07:38 PM
milomilo's Avatar
milomilo milomilo is offline
Auction Addict
Join Date: May 2010
Location: Wheatland, Wyoming
Posts: 15,856

Would a claymore (m18A1) be more effective? I am not much help on what you are looking for.

Liberty has never come from Government. Liberty has always come from the subjects of it. The history of liberty is a history of limitations of governmental power, not the increase of it.
Woodrow Wilson
Reply With Quote
Old 05-08-2018, 08:11 PM
Scratch Scratch is offline
Senior Member
Join Date: Feb 2007
Location: Hudson WI
Posts: 550

Interested in buying a professional one at a good discount? I have some... I used to install them for a living.
Reply With Quote
Old 05-08-2018, 08:19 PM
Ironman's Avatar
Ironman Ironman is offline
Iron Modification Investigator
Join Date: Feb 2008
Location: Warburg, Alberta, Canada
Posts: 14,429

To get a motion detector camera that sends warnings to a smart fone is common as fleas.
Here is some info on frequencies if you want to build your own.
The possibility of a device that produces frequency that causes vibration of the eyeballs—and therefore distortion of vision—was apparently confirmed by the work of paranormal researcher Vic Tandy in the 1990s while attempting to demystify a “haunting” in his laboratory in Coventry. This “spook” was characterized by a feeling of unease and vague glimpses of a grey apparition. Some detective work implicated a newly installed extractor fan that, Tandy found, was generating infrasound of 18.9 Hz, 0.3 Hz, and 9 Hz.
Then there is this site for plug and play instruments. Go to the ultrasonics.html page.

I like their warning.
Ultrasonics are a gray area in many respects when application involves the control of animals or even as a human deterrent to unauthorized intrusion. It is always best to consult with local municipal and state laws before using this device to protect home or property. REMEMBER MANY STATE LAWS LEAN MORE TOWARDS THE “RIGHTS OF THE CRIMINAL” RATHER THAN THE VICTIM.
Your sonic acoustical generator is intended for use as a security or property protection device.
Please be aware that certain states do not allow the use of any device that may discourage or impede any criminal activity,
claiming such use is a violation of the law breakers civil rights.
Always check with the proper authorities before installing this device with the intent of
discouraging illegal entry or protection of your personal home or property.
We have been alerted that use in MASS, NYC, and WASH DC may require licensing
restrictions in the future when used for security or property protection involving a possible
violation of the law breakers rights!
We have provided the finished device without labeling or control identification for the users
protection should he run into any of these stupid regulations
The user may choose to do his labeling using the instructions and a suitable marking pen
You got freedom of speech, if you don't say too much.
Aaron Neville.

The virtue is always a cover for the sin. That's the key to understanding the modern left. Whatever they're accusing you of doing, they are doing themselves but more enthusiastically. And that's definitely the story of Justin Trudeau. Tucker Carlson

Last edited by Ironman; 05-08-2018 at 08:27 PM.
Reply With Quote
Old 05-08-2018, 08:44 PM
Whitetrash's Avatar
Whitetrash Whitetrash is offline
Elite Member
Join Date: Mar 2009
Location: Estes Park, CO [Around 8000 Ft. Elv.]
Posts: 3,173

I'm thinking one of these up in the corner of the shop near the ceiling with an alarm activated solenoid valve controlling it's air supply
"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery."
Winston Churchill
Reply With Quote
Old 05-08-2018, 11:00 PM
Samcord Samcord is offline
Elite Member
Join Date: Jun 2012
Location: Peoria
Posts: 2,070

Some thoughts -
You don’t want to risk causing damage to anyone, including yourself. The courts could steal everything from you and give it to the perps.

What kind of sensors are you thinking? Door/window open, glass breakage, motion, fire/smoke.

If a sensor goes bad while you are away, what will you do? I have had this happen. I was able to disable the sensor remotely and re-arm. This is also a good reason for multiple sensors like window and motion.

Monitored sensors are a good idea in the event of a loose connection or a broken or cut wire.
Reply With Quote
Old 05-08-2018, 11:35 PM
SmokinDodge's Avatar
SmokinDodge SmokinDodge is offline
Post Fiend
Join Date: Feb 2006
Location: Missouri
Posts: 5,869

My buddy used/uses an old fire truck toradial siren on a transformer and a motion sensor. You will loose your mind before you ever get close enough to shut it off. It’s heard up to two miles away. He has a switch conveniently located to disarm it for white folks to enter. Very, very effective.
The guy that said money can't buy happiness never bought a tank of fuel for a turbo diesel.............
Reply With Quote
Old 05-09-2018, 10:35 AM
MetalWolf's Avatar
MetalWolf MetalWolf is offline
Lubrication Consultant
Join Date: Jan 2011
Location: La Vernia,Tx.
Posts: 3,601

Your In Florida You should get you one of these Ligers throw it in the shop with a small side of beef for the first day your gone after that anything that goes in will be sitting in the same spot when you get back a little piled perhaps... .....But you wont be missing anything but you could achieve the same with the smaller Bengali variety
Reply With Quote
Old 05-09-2018, 04:43 PM
kbs2244 kbs2244 is offline
Elite Member
Join Date: Sep 2006
Location: Way North Illinois
Posts: 1,652

This type of thing varies by state
But FL has some pretty good "home is my castle" laws.
I do not know how this applies to non-residential buildings.

Get some local lawyer advice/protection, and maybe inform the local police of your plans.

At the least, that should put you on the nightly "drive by" list and increase the police presence in your area.

That in itself may be all you need.

But, I think, the low freq to BM connection has been proven.
"Sound cannons" have been used in crowd control in Europe.
Reply With Quote
Old 05-09-2018, 05:07 PM
GWIZ's Avatar
GWIZ GWIZ is offline
SFT Historian
Join Date: Feb 2006
Location: USA
Posts: 7,003

animals maybe another issue.

"The report "A Review of Published Research on Low Frequency Noise and its Effects" contains a long list of research about exposure to high-level infrasound among humans and animals. For instance, in 1972, Borredon exposed 42 young men to tones at 7.5 Hz at 130 dB for 50 minutes. This exposure caused no adverse effects other than reported drowsiness and a slight blood pressure increase. In 1975, Slarve and Johnson exposed four male subjects to infrasound at frequencies from 1 to 20 Hz, for eight minutes at a time, at levels up to 144 dB SPL. There was no evidence of any detrimental effect other than middle ear discomfort. Tests of high-intensity infrasound on animals resulted in measurable changes, such as cell changes and ruptured blood vessel walls."
The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment. ~Warren G. Bennis
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Web Search:

All times are GMT -5. The time now is 01:39 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.