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Digital slave flash trigger

Discussion in 'Electronic Projects' started by Rolf, Aug 2, 2006.

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  1. Rolf

    Rolf Member

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    This unique circuit has been tried with all three of my cameras and two others and works perfectly. It ignores all pre-flashes and only triggers on the last (main) flash.
    No adjustments are needed. It will be tested with more cameras as they become available.
    The current drawn is just 2.2mA at 3v. (about 4.2mA at 6v)The AA batteries were only used for making and testing the prototype. The finished unit will use a coin cell. The unit will handle trigger voltages up to 400v. Which I think will handle most commercial strobe units.
    The range with 3v is about 25', I am going to work on that. That was much better when I used a 6v battery. There is now a ON / OFF sw. But the blinking LED (shown only in the picture) has been removed, drew to much current.
    The hot-shoe was from an old camera I got in a junk store for $ 1.00.

    [​IMG]
    [​IMG]

    This design is now outdated because of this: http://www.pbase.com/sinoline/pic_slave_flash
     
    Last edited: Sep 15, 2006
  2. jatinder singh

    jatinder singh New Member

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    can any bodt tell mewhat it is ?
     
  3. jatinder singh

    jatinder singh New Member

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    can any body tell mr what it is?
     
  4. dave

    Dave New Member

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  5. Rolf

    Rolf Member

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    This Digital Slave Flash Trigger allows a regular flash to be used with a PS (point & shoot) digital camera.
    For a simpler one, see: http://www.pbase.com/sinoline/pic_ii
    For more info just do a little Googeling.
     
    Last edited: Feb 26, 2007
  6. Hero999

    Hero999 Banned

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    Wow, what a moron?

    Anyway Rolf, how did you get your project to work from 3V when the datasheet for the NE556 specifies a minimum of 4.5V?

    That 3V battery wouldn't last long?

    Or did you use a CMOS timer like the 7556 or TS556?
     
  7. Rolf

    Rolf Member

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    The sensitivity was much better with 6v. When I am experimenting I don't even think about data sheets. Mine is marked NE556N the 4011 is unmarked.

    Took the LED out (it was ok when using 4xaaa's for power) and the circuit now draws 2.2mA. The button battery is 180mAH so there is plenty of longevity if you can remember to turn it off.
     
  8. audioguru

    audioguru Well-Known Member Most Helpful Member

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    There are reasons that manufacturers spec an absolute minimum supply voltage of 4.5V for a 555 and 556 IC. You might be lucky to find one that works with only 3V. Does it still work when the battery discharges to 2.999V?
    If you make another one then I bet it won't work with only 3V.
     
  9. Rolf

    Rolf Member

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    How much are you willing to bet?
    The one pictured in my original post is actually the second unit I buildt.
    If you are so interested to prove me wrong, buid one for yourself. I have put this project on the shelf and are not going to resorect it, just to prove a point. I have now built and use Povel Janko's PIC design (jankop@volny.cz) which made mine obsolete.
     
  10. audioguru

    audioguru Well-Known Member Most Helpful Member

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    I use Cmos 555's for low voltage and low current stuff. That's what they are designed for.
     
  11. Rolf

    Rolf Member

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    GOODY FOR YOU!
     
  12. Cool_buddy_57

    Cool_buddy_57 New Member

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    What is this
    and how it works..?
     
  13. seema_feb1986

    seema_feb1986 New Member

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    dear sir


    plzz tell me in digital flash trigger's mcr 100-6 's anode and cathod pole attached to flash or power ?
    seema
     
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