Simple cheap alarm design.

[ptonce]

Here's a good one.
Phone call yesterday from the trailer guy.
I got good news and bad news.
Good news is your trailer is built and off the line on schedule.
The bad news is they put on a "dummy" spring axle to run down the line until your torsionflex came in to change over to. Seems they forgot to change the axle out.
We'll get it back on line to fix it but it will delay delivery a week.
( I can picture a shop foreman pointing to an axle sitting in the corner asking "what the #%@ is that thing for!)

 

[patrick_g]

Hey!!

soundguy

An extension of the philosophy a business associate of mine once expressed. He said it something like this:

We will share the responsibilities and rewards equally. You do the work and I will do the worrying. You take the blame and I will take the credit. If all goes bad and they are going to tar and feather us, they can tar you and feather me!

Pat

 

[Soundguy]

Kinda like a scapegoat/hang out to dry type situation huh?

soundguy

 

[patrick_g]

Kinda like a scapegoat/hang out to dry type situation huh?

soundguy

Well, not exactly. In his mind (but only joking) it was a fair and even distribution of responsibility and reward. Sort of a version of the "from each according to ability and to each according to need," but a tad perverted.

He was a WW II Navy vet who had survived three ship sinkings, two in one day. He was the promoter/sales half of our dynamic duo and I was the young scientist/engineer out to perform miracles on a stringent time table.

I still recall my associate telling my wife to stick with me and I'd have her wearing onions as big as pearls!

He was a plane captain on a carrier in the South Pacific. Recall the news reel footage of a carrier plane landing and breaking in half... He was on deck close by.

I consider myself very blessed to have had three good friends who were WW II vets. They were really special folks and only one of them is above ground and still active.

Pat

 

[ptonce]

I sure like the way you guys think! I think.

 

[patrick_g]

I sure like the way you guys think! I think.

If you had socialized medicine you would be rounded up for psychiatric counseling making statements like that!

By the way, I have an aunt and a cousin in Woodruff.

Pat

 

[ptonce]

How about that! Woodruff is a short drive away.

I'll bet they like their weather better than yours.

 

[rebb]

Pat,

this whole exchange was so worthwhile for me, i made a document file and pasted in all the instructions and changes. thanks a heap!

have you made any adjustments in this design in the meantime? i intend to use low voltage wire and 'strands' connected to 'self tapping screws' on the windows and doors of my shop for my system. only thing won't be armed is the 'auto open garage door'.....for when i have to go someplace for a few days-walk out or drive out, hit the closer, and drive away....otherwise, the whole place will be armed. convenient that this is the year the truck battery needs changed out (every 3 years, need to or not).

any updates would be appreciated fore i start hunting this stuff down.

agree on the wwII vets; my Dad was one. they were (and are) a precious resource....

rebb

 

[patrick_g]

Rebb, I am pleased you find the information useful. No, I haven't made any design changes, thought about it since, or touched it lately. I gave it to my friend who needed some protection.

It is a pretty simple straight forward circuit, really basic, but it works. It is OLD technology, no integrated circuits, opto-isolators, micro-controllers or such.

The addition of some more ancient technology (not technology of the ANCIENTS, in case you are a SG-1 fan) could accommodate your garage doors. I googled on 12NO30 and somewhat to my surprise such are in stock and easily available. I hadn't used one of those since the mid-late 60's. That part is in a family of timers. The original mechanization/realization of that part was a filament/heater that took 30 sec to heat a "thingy" (bimetal strip or such) so that it moved and made (or broke) contact between a couple electrodes. There is also a NC (normally closed version that goes open on heating after the time delay. Modern versions may not be so crude as to have heaters and moving metal but could be functionally equivalent and fully compatible.

Using this sort of thing could give you the chance to alarm your garage doors as it would allow you to set your alarm and have 30-45-60-120 seconds (depending on the timer you picked) to exit the garage and have the doors closed before the doors were included in the alarm circuit. You would have to have a switch or other means of defeating the garage door circuit from outside the garage. In thriller movies this switch would be a vulnerability that would allow the Mission Impossible guy to break in undetected. In real life the class of burglar's you will most likely contend with will not defeat a circular security key type switch and if by some miracle they do they are in the garage undetected just as if you did not alarm the garage but the rest of the alarm is as it would have been with no change in the level of your protection.

If this appeals to you let me know and I will think about it when I get a chance and draw a schematic for it. I didn't price check the timers but you could easily if you google on 12no whatever or 12nc whatever (where whatever is 30, 45, 60, or 120)

Pat

 

[Egon]

If you had socialized medicine you would be rounded up for psychiatric counseling making statements like that!

Elucidate please.