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Auto immobilizer

Discussion in 'Electronic Basics' started by [email protected], Jul 18, 2008.

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  1. Guest

    Good day

    I wonder if anyone can help me?
    I am trying to make an auto immobilizer. I have a uhf key chain type
    transmitter and a matching receiver. My problem is the receiver
    doesn't give me a latch or constant switched +12v only a momentary
    +12v, I assume for a siren chirp. Can you provide me with a circuit to
    take the momentary +12v and use it to latch a relay with which I will
    immobilize the vehicle, until I re energize the receiver and then it
    will unlatch. I have tried using 2 x 12v relays but cant figure out
    how to wire them up to give me a latch.

    My e-mail address to reply to me at is:

    Thank you and regards.

    Hilton Spark.
  2. neon


    Oct 21, 2006
    just a couple of gates [CMOS] Can do it and one relay,
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