Simple cheap alarm design.

[patrick_g]

Patrick,
You ideas are hilarious. The first item made me smile but the final two had me laughing outloud. Especially the part about the hellicopters.

Remember RADAR O'Reilly on the TV series, "MASH?" Well those dogs were similar. They would start getting antsy before anyone else heard the choppers.

"Gee dear, I don't know whey the dogs hate choppers so much, maybe there is something special about the sound of the chopper that they don't like!"

Meanwhile, the dogs are experiencing the equivalent of having a steam whistle go off inside your head but at frequencies people can't hear.

I have always thought deer could be deterred with ultrasonics but never had enough incentive to set up an experiment. If you put out enough ultrasonics just above human hearing say 25-30KHz you could run the volume up till you melted their antlers and they would try to make it to the next county but people would not hear a thing.

Of course there is always the possibility for collateral damage. The Racoon and Opossum's local union reps or their PETA fellow travelers might have a hissy fit along with any nearby dogs, cats, many birds, etc.

Pat

 

[Soundguy]

That circuit will sure be robust.. but very 'party'.. lots of contacts to wire in.. but heck.. it's clean and it works... what can ya say?

soundguy

 

[Soundguy]

Don't get me wrong.. I wasn't berating the design.. I like robust designs. It's just one with , depending on how many legs and doors.. etc. you have.. especially bypass or delay ones.. that the system is getting pretty big with lots of relay work.. nutting wrong with that though. Ditto ont he buzzer / buffer relay... lets you drive a real big one.. perhaps blinking lamps too!

soundguy

 

[patrick_g]

No problemo, SoundGuy, I just wasn't sure of your reference.

Should require only one delay relay for all delayed alarm ingress doors but nothing bad if you delay all doors unless you worry about home invasion while you are there and then there are bigger problems.

Surprisingly, no one squawked about the original drawing even though as shown there was no exit delay and you would have to have the controls outside the alarmed space or only use it with the space occupied.

As far as complicated wiring goes, the professionally installed system in our new house has the sensors in series parallel strings. Way too many sensors for reasonably available panels. So groups of sensors are wired in series. then the several groups each go to a single circuit at the panel. Of course the glass breaks and motion detectors are not bundled with windows and doors. This way you can leave a window open and still set the alarm. relying on the motion detector in that area to catch an intruder.

One of the best features of our system is the cell phone module which keeps the system monitoring capability intact even if the phone line is cut. That and the contacts they provided me by my request so I can trigger any action in tandem with the sirens. Like my truck which pages me if the alarm is activated, so can the house. This is not through a regular pay for play pager but direct from a transmitter module triggered by the panel to call the pager.

I thought about opening a valve to a 80CF aluminum scuba bottle (super noisy) and then playing a recorded message over the whole house intercom, "You have been exposed to a colorless, odorless, and tasteless poison gas. after you turn yourself into the police have them contact (phone number) for antidote information. You have about 30-45 min." Of course the message would be in idiomatic Spanish as well as English.

Pat

 

[Soundguy]

All this talk of alarm designs got me to thinking.

If our justice system weren't so lax on property crimes and personal rights of victoms.. and they would just let you execute each and every thief you catch.. my guess is there would be less need for things like this.

.. oh sorry.. I must have been daydreaming again!

soundguy

 

[Egon]

"You have been exposed to a colorless, odorless, and tasteless poison gas. after you turn yourself into the police have them contact (phone number) for antidote information. You have about 30-45 min." Of course the message would be in idiomatic Spanish as well as English.

Throw in a Halon system that dumps.

 

[rebb]

Pat,

i never said nuthin' bout the original design 'cause it was perfect for my application-the garage doors, i figured would be the last thing they hit, as the windows are much easier to break and crawl in through first...especially the offside to the house one-i get about as much lightning and storms as you prolly do, also-flimsy don't cut it around my place. the delay switches are jsut an added bonus in case they happen to get in a window without breaking a wire. actually, the first one in is gonna open the service door for the rest of them, anyway, and break that wire, chances are....

did i tell you the little 102 db piezo alarm i bought is way loud? i'm trying to find a small flashing led that would serve as a visual for my def neighbor (lol!). the other alarm came in-weather proof, and also loud, but in a different frequency range...good karma...

the russians aren't stupid at all. lol! some western systems are not 'genius' in action; we are so over-dependent on a very vulnerable internet and off shore parts...hmmmm....lol! i recall being at work one day, when everything went down...some poor fool backed his backhoe into the main electric station; fried him, killed everything except the traffic lights...we got sent home...the 'human sensing toilet flushers' wouldn't work either (why do we need those again?)

simple works...fancy sometimes don't.
reb

 

[Soundguy]

You know.. if they just offered a bounty on any crooks head.. it might start to self limit too.. I bet crooks would start turning in other crooks!

soundguy