Hmm...
Quote:
i wanna know abt the key chain which is used for car security system......
Which system? OEM? Aftermarket? Do you mean the wireless frequenc[y|ies] used?
Quote:
m gona start my project on it.....
Do you intend to utilize the (most-likely) frequency-hopping/spread spectrum wireless remote of a car alarm? Do you expect to just "plug into it"? Outside of an "accessory" relay, I don't think you'll get much functionality from such a scheme.
Quote:
if anyone knows k what is da circuitary of those keychains tu kindly do inform me......
Aaaand I'm lost. Is the answer 'c'?
In all seriousness, you'd be best served by starting
here.
In less seriousness, spend some time
here while you're at it.