Considering the low incidence of Mensa members, National Merit Scholars,
and successful, moderately bright folks who earn enough money to buy
what they desire rather than steal it from parked cars, I would hold
that thought if I were you!<g>
On Mon, 20 Aug 2007 20:44:45 -0500, Unquestionably Confused wrote:
If they have guns for petty larceny, they're toast. We have tough gun laws
here, and they'll go up a long time.
Hope the few hundred dollars they boost is worth the time. They've already
busted into the next door neighbor of a State Cop...he only parks his
cruiser outside his house 3-4 times a week...
Hmmm....what were you saying about a dearth of Mensa members...? ;)
there might even be more than one auto burglar,and it's not hard to take
away a baseball bat.
Get a baby monitor,the digital ones have the best range.
Then you can listen in on your car,effectively a silent alarm.
If they break a window or open the door,you will hear it,and they will have
no indication of an alarm.(they are not "cheap",though)
Make an adapter to allow it to run off the 12V auto cig lighter.
I fondly remember back in the 1960's when my roomate bought a Honda 90
and was worried that someone might steal it. He actually did that for a
couple of nights though there was no Glock available. (Provided service
revolvers were locked away to prevent mischief). Quite a feat
considering that we lived on the third floor of a high rise...
(Yep, the ol' Army days in DC)
All I've read so far are questions about how the car owner would
switch an unidentified alarm system off and on. Since you are not
buying an off-the-shelf alarm what kind of alarm system are you
proposing. And more importantly how will the alarm be triggered by a
Why not just have a scr trigger from the interior light?
The scr will switch the horn relay to ground.
Door opens, light switch fires SCR, horn blows until someone turns off
the hidden (under dashboard or seat) switch, which breaks the circuit to
SCR. You could use a capacitor to give you a few seconds to leave or
enter the car.
After thinking about it, you may have to use a transistor to invert the
signal from the door switch. You could set up your delay with the
capacitor, resistor, to wait 10 or so seconds before firing the
transistor, which would then set the scr.
Back in the 70's when the price of gas was rocketing, people stealing
gas from your car at night became a common occurance.
I thought about attaching a small magnetic reed switch to the gas cap
cover that would do the same thing. Just never got around to doing it.
One guy I know wired a 120 volt hot wire to the frame of his car. I
wouldnt recommend doing this though, it could kill someone and give you
a manslaughter charge.
(I know, it shouldnt be against the law to kill a thief, but it is.)
On Tue, 21 Aug 2007 08:24:26 -0700, John S. wrote:
All I want is something that will blow the horn, and maybe flash the
In it's simplest form, a switch mounted somewhere outside the car that
turns the system 'on' by providing a ground path for a relay. When someone
opens a door, the relay closes, current is passed to a flasher (like for
your turn signals) and then to the horn and headlight relays. Very simple.
Also, this is instantaneous. As soon as they open the door, the horn
starts. There is an 'always on' current source (courtesy lights) that do
not turn off when the dome light is turned off, so I intend to use this
for the 'trigger'.
looks to me like you have it all figured out. So why are you asking us this?
You know you could give away your secret device.
For instance, from this conversation thus far, if I were a crook, I
would know to look under the fender of your car for a keyswitch. Then
take a sharp chisel and hammer and shear the switch off, then cut the
wires to the switch, then get on with business as usual.
Sometimes the best intrusion device is to catch the crook offguard.
I kinda like the string tied to the toe suggestion. Ive heard it works
for napping while fishing too.
Basically, wanted to see if it was feasible. (If anyone would say, "I
wouldn't do that if I were you...").
I was an elec. tech for 19 years, and a geek for the past 15. I know my
way around a ckt or two... ;)
As far as giving away a 'secret', if these guys even know what Usenet is,
I'd be surprised.
Either that, or they'd post a message like, "This is a great site!" ;)
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