Re: Alarm delay in car?

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#147

From: SparksRFlyin
Date: Thu, 15 Aug 2002 22:20

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DaveC wrote:

> 
> What post? I see no other posts by ehsjr@bellatlantic.net

I see 8 posts in this thread including yours, two by
ehjr@bellatlantic.net.  Maybe you should try a different
newsreader. 

FYI, ehsjr wrote in the post you did not see:

Good idea.  1 relay, resistor, capacitor, zener and
transistor.
Connect the R & C in series - one side to + that gets
switched
on with the ignition, the other side to ground.  With a 9V
zener
connected between the base of the transistor and the
junction
of the R & C, the transistor can turn on after the RC time
delay
charges the cap to the point where the zener conducts. That
"satisfies" one side of the relay coil. The other side
connects
to the idiot lite. If you want to use more than one idiot
lite
to trigger the alarm, install diodes between the idiot lite
and
the relay coil.  You'll have to determine how the idiot
lites
are switched - either + or minus can be switched (but my
bet,
based on limited auto experience, is that the minus is
switched).
Once you know how they are switched you can design the
transistor
switch to switch the opposite polarity.

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From: SparksRFlyin <no.spam@hotmail.com>
Newsgroups: sci.electronics.basics,sci.electronics.design,alt.engineering.electrical,aus.electronics
Subject: Re: Alarm delay in car?
Date: Thu, 15 Aug 2002 17:20:56 -0500
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