How can I drive an HID Strobe lights to flash as police lights?

Discussion in 'General Electronics Chat' started by KB1VSP, Sep 11, 2011.

  1. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    I am adding strobes to my "Police Lawn Mower" wich has Led strobes. Not enoughf so i want to have 4 strobes on it... strobes 1 and 2 to flash 3 times and then strobes 3 and 4 flash 3 times... (Like the Hideaway strobes in cop cars) I want to build a circut that is farily simple and inexpensive (becides the bulbs)
    -Victor

    http://www.youtube.com/watch?v=abBPnukjGC8
     
  2. maxpower097

    Well-Known Member

    Feb 20, 2009
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    Most police liights don't flash. The front white lights and headlights flash, but the top sirens are a continuous light that has a mirror that spins around simulating a flashing light. For the headlights I prefer the on-off/off-on/on-off type. So while one lights up the other goes out. That what most cops here use.
     
  3. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    I have those wigwag lights ... i want HID strobes... any kind of circut anyone can come up with?
     
  4. Wendy

    Moderator

    Mar 24, 2008
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    Actually it is not hard. You charge up a cap with a DC/DC converter, trigger the strobe unit with the step up transformer, and repeat. It could be triggered with a 555 or 4017 circuit used to drive LEDs.

    .LEDs, 555s, Flashers, and Light Chasers
    Chapter 11 - Making patterns.

    Radio Shack used to sell the xenon strobe and transformer, but no more.

    There is another problem also, a circuit like this comes very close to violating our terms of service (ToS). If a mod clears it I will throw some ideas out.
     
  5. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    Thats what i was thinking. use 555 led circut to trigger.. do you have a simple shematic of how i would charge and trigger a strobe? i have the 555 circut down...

    Its Not illeagal in any way what i am doing... (Just putting it on a lawnmower lol)
     
    Last edited: Sep 12, 2011
  6. Wendy

    Moderator

    Mar 24, 2008
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    It's not that, it is more the high voltage end. If I can I'll try sketching something up since the thread is still open.

    I'm not triggering it with the LED, I would be using the current that would be going to the LED to excite the strobe transformer instead.
     
  7. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    Oh. i see... If you can draw a svhematic that would be great:D
     
  8. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    Any progress on that schematic? :)
     
  9. colinb

    Active Member

    Jun 15, 2011
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    Well, where I live in the U.S. all the state patrol and city police cars use high power LED strobes. They are unbelievably bright! I would love to see a design description of one of those patrol car light bars. They must have several hundred watts of LED power.
     
  10. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    Yes, I noticed they are verry bright... but i am looking for that signaature strobe flash... i have leds already
     
  11. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    any suggestions on a schematic?
     
  12. Wendy

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    Mar 24, 2008
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    Sorry, got distracted. Do you have the 4KV step up transformer to fee the strobe tube?
     
  13. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    Not yet. I was going to see if i can find a good setup (Schematic) before i buy things... Once i get a good circut plan put together, i will find some bulbs and transformers...
     
  14. Wendy

    Moderator

    Mar 24, 2008
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    OK, here is a rough sketch of what I was talking about. It is based of the Forrest Mimms diagrams, which are all over the web.

    [​IMG]

    I've never built this, but the idea is when the transistor turns on the capacitor dumps its charge though the transformer, firing the Xenon tube.
     
  15. VoodooMojo

    Active Member

    Nov 28, 2009
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  16. Wendy

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  17. VoodooMojo

    Active Member

    Nov 28, 2009
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    You are more than likely correct about that.
    With LEDs and lenses being as bright as they are, its been awhile since I have messed with xenon tubes.
     
  18. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    not bad price but ill stick with building it... Its for a lawnmower so im on a budget...
     
  19. Wendy

    Moderator

    Mar 24, 2008
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    Let us know how it goes. I'm always interested in projects like this.
     
  20. KB1VSP

    Thread Starter New Member

    Sep 11, 2011
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    Ill attempt the project soon. ill let you know what goes on. Ill be making anoother video anyway:)
     
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