A much needed delay

Discussion in 'General Electronics Chat' started by chunky2, Dec 7, 2014.

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  1. chunky2

    Thread Starter New Member

    Aug 5, 2007
    Hi Guys I have an MP3 trike with an additional air horn which goes off when I press the bikes horn button.
    I would like to introduce a small delay in my air horn (143db) setup.
    I have included a jpeg to show my current setup. As you can see from the existing headlamp relay, I have taken a grey wire to a new relay. This wire goes live only when the engine is running. From a new fuse box I am powering the new air horn. What I would like to do is delay the air horn going off for an adjustable 0-1.5 seconds, in this way the on board horn goes off when I press the button for a friendly meep meep, but when I need a BLATT by holding the button for about a second before the air horn kicks in. If possible be also able to flash the main head lamp as well. The screaming banshee (139db) air horn has such a unit, but this is about £50 plus import duty, if you can get one without the horn it self. The air horn draws about 20 Amps and the main beam is about 5 Amps. the 2 new relays have 40 Amp contacts.
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
    Closing in 5, 4, 3, 2, ...
  3. k7elp60

    Active Member

    Nov 4, 2008
    I have just the thing for you. I have a small circuit board that once the power is applied a short delay that is preset, but can be changed with a resistor that will turn the air horn on after the delay. All you would have to do is connect the yellow wire to board, a ground to the board and a wire from the board to the pink yellow wire. I can assemble the board and put pigtail wires on it so you can connect it your system.
    As a side note I used to build these for a customer that needed a similar delay when pushing a button in the car.
    Please PM if interested.
    Chopski likes this.
  4. chunky2

    Thread Starter New Member

    Aug 5, 2007
    I think I have sent you a PM
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    .... 3,2,1, still not closed?
  6. MrChips


    Oct 2, 2009
    The owners of All About Circuits have elected not to allow discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)

    Here is a site that may provide you with some assistance: Electro Tech Online

    Good luck
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