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Sequential flasher Circuit

Discussion in 'Electronic Design' started by RJ, Jan 22, 2006.

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  1. RJ

    RJ Guest

    Anyone have any info/schematic for automotive (12V) sequential flasher
    circuit. Looking for something that will run a string of bulbs left to
    right, right to left, and center out. 55W halogen bulbs. Also known as a
    "Traffic Advisor" and is mounted on the rear of a cruiser. Thanks any and
    all.............

    Dick J
    Gahanna Police Dept, Ohio
     
  2. Jim Thompson

    Jim Thompson Guest

    http://www.analog-innovations.com/SED/Pat-3544962.pdf

    ...Jim Thompson
     
  3. John Fields

    John Fields Guest

    ---
    Just another example of the USPTO's inability to deal with banality.

    Thompson's circuitry wasn't novel when he applied for the patent,
    but by confusing the examiner(s) they decided that the safe way to
    go was to issue the patent and, more importantly, collect the fees.
     
  4. Fred Bloggs

    Fred Bloggs Guest

    Anyone have any info/schematic for automotive (12V) sequential flasher
    How many bulbs? Eight? Chances are it will be cheaper to buy a
    programmable power supply new or used. The electronics and packaging
    thereof are non-trivial mainly due to the required protection against
    vehicle electrical system transients, bulb inrush currents, and
    automotive environment extremes of temperature, shock, and vibration.
    The product needs to be rugged IOW.
     
  5. Jim Thompson

    Jim Thompson Guest

    I would think the Gahanna (Ohio) Police Dept could just go out and buy
    the unit.

    That state has more speed radar units than dogs have fleas. I think
    that must be Ohio's primary source of (tax) income.

    When I have to make the run from Columbus to Huntington to visit my
    father I DON'T drive 50... I generally double it.

    So it keeps me on my toes watching for those clowns ;-)

    ...Jim Thompson
     
  6. Jim doesn't care. By his own admission, he's "filthy rich", and according
    to his previous post, he's somewhat of a scofflaw, which is ironic, given
    his admitted nazi tendencies.

    Thanks!
    Rich
     
  7. Don Foreman

    Don Foreman Guest

    Good point! Many here could devise a circuit using MOSFET lamp
    drivers and a PIC microcontroller -- but who would build it and
    package it? It's hard to save any money building a few of
    something that is commercially available.
     
  8. ehsjr

    ehsjr Guest

    Your call - but if it's for your job, I would think a commercial
    unit would be what you want. But if you enjoy experimenting, you
    might like the circuit described and diagramed below.

    There are diagrams below the text.

    4 decade counters, 9 bulbs: (can be more than 9 bulbs
    with additional decade counters)
    The "master_counter" 1 one counts 0 to 2 and resets at 3, so it
    has 3 active outputs: 0, then 1, then 2. All decade
    counters will have only 1 output active at any given time.
    Bulbs will be wired to drivers, and the drivers will be
    connected to decade outputs 1 through 9 through diodes.

    The master_counter will sequentialy enable counter0,
    counter1 and counter2 when master_counter_0, 1 and 2
    go active. The master_counter will be incremented
    when counter0 or 1 reaches 9, or when counter2 reaches 5

    Counter0 will sequentially light bulbs
    1 2 3 4 5 6 7 8 9 yielding this ==> direction

    Counter1 will sequentially light bulbs
    9 8 7 6 5 4 3 2 1 yielding this <== direction

    counter2 will light first bulb 5, then in pairs:
    6&4, 7&3, 2&8, 1&9 yielding this <= => direction

    When counter2 increments to 5, it will reset itself and increment
    the mastercounter

    A typical decade counter circuit is shown here:
    http://www.doctronics.co.uk/4017.htm

    Your drivers can be n channel mosfets, wired source to
    ground, drain to bulb, bulb to plus. The gates of
    each mosfet will connect to 3 diodes, with the banded
    end of the diode connected to the gate and the other end
    connected to the 0, or 1 or 2 ... or 8 line of the
    decade counter.

    ---------------
    | mastercounter | DR = driver, detail shown below
    ---------------
    0 1 2
    | | |
    --- | |
    | C |0-------->|---------------------Dr1---Bulb1--+--- +V
    | o |1-------->|---------------------+ |
    | u |2-------->|-------------------+ | |
    | n |3-------->|-----------------+ | Dr2---Bulb2--+
    | t |4-------->|---------------+ | +-+ |
    | e |5-------->|-------------+ | | | |
    | r |6-------->|-----------+ | | | Dr3---Bulb3--+
    | |7-------->|---------+ | | | +---+ |
    | 1 |8-------->|-------+ | | | | | |
    --- | | | | | | | Dr4---Bulb4--+
    | | | | | | | +-----+ |
    +---+ | | | | | | | |
    | | | | | | | Dr5---Bulb5--+
    | | | | | | +-------+ |
    | | | | | | | |
    | | | | | | Dr6---Bulb6--+
    | | | | | +---------+ |
    | | | | | | |
    | | | | | Dr7---Bulb7--+
    | | | | +-+---------+ |
    | | | | | | |
    | | | | | Dr8---Bulb8--+
    | | | +-+-----------+ |
    | | | | | | |
    | --- | | | Dr9---Bulb9--+
    | | C |0-------->|---+ |
    | | o |1-------->|-----+
    | | u |2-------->|--- To Dr7
    | | n |3-------->|--- To Dr6
    | | t |4-------->|--- To Dr5
    | | e |5-------->|--- To Dr4
    | | r |6-------->|--- To Dr3
    | | |7-------->|--- To Dr2
    | | 2 |8-------->|--- To Dr1
    | --- |
    | 9 |
    | | |
    +---------+ ---
    | | C |0-+->|--- To Dr5
    | | |
    | | o |1-+->|--- To Dr6
    | | | +->|--- To Dr4
    | | |
    | | u |2-+->|--- To Dr7
    | | | +->|--- To Dr3
    | | |
    | | n |3-+->|--- To Dr8
    | | | +->|--- To Dr2
    | | |
    | | t |4-+->|--- To Dr9
    | | | +->|--- To Dr1
    | | |
    | | e |5---+
    | | r |6 |
    | | 0 |7 |
    | | |8 |
    | --- |
    | |
    +---------------------+


    Driver detail:
    V+
    |
    Bulb
    |
    ||---+ D
    | ||
    G ----- ||---+ S
    |
    Gnd

    Counter enabling via the master counter & power on reset:

    Counter0 Counter1 Counter2
    Enable Enable Enable
    Pin13 Pin13 Pin13
    | | |
    +-+ +-+ +-+
    -------- | | | | | |
    |Master |0-+->|---------------------+ | | |
    |Counter | +->|-----------------------------+ |
    | | | | | | |
    | |1-+->|-----------+ | | |
    | | +->|-------------------------------+
    | | | | |
    | |2-+->|-------------+ |
    | | +->|-----------------------+
    | |
    | |3---+ +--->|--- To pin 15 Counter0
    -------- | +--->|--- To pin 15 Counter1
    Reset | +--->|--- To pin 15 Counter2
    Pin15 | |
    | | | 10 uF
    +---------+---|<---+---||------- +V
    |
    [15K]
    |
    Gnd

    Clocking:
    The clock shown at
    http://www.doctronics.co.uk/4017.htm
    will connect to Counters 0, 1 and 2.
    It will not connect to the mastercounter.

    The mastercounter clock pin - pin 14 - will connect
    to 3 diodes (non-banded end). The other end of the diodes
    will connect to output 9 (pin 11) of counter0 and counter1,
    and to outpiut 5 (pin 1) of counter2.

    Ed
     
  9. ehsjr

    ehsjr Guest

    Grumble. Forgot 2 resistors - added below:

    Driver detail:
    V+
    |
    Bulb
    |
    ||---+ D
    G | ||
    ---[1.5K]---+--- ||---+ S
    | |
    [100K] |
    | |
    +----------+
    Gnd
     
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