optical slave flash trigger for Vivitar 1900!

Discussion in 'The Projects Forum' started by owaisphotography, Jul 9, 2011.

  1. owaisphotography

    Thread Starter New Member

    Jul 9, 2011
    3
    0
    hi guys
    i need your help
    please help me to make optical slave tirgger for
    "Vivitar Electronics Flash 1900"
    [​IMG]
    [​IMG]
    Please help me its really important for me!

    Thanks
     
  2. iONic

    AAC Fanatic!

    Nov 16, 2007
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    68
    I guess it would be benificial to know what camera you have as well, or are your intentions to merely set the flash off no matter where it is? Perhaps you could give us an example of the specific use once modified.
     
  3. Markd77

    Senior Member

    Sep 7, 2009
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  4. owaisphotography

    Thread Starter New Member

    Jul 9, 2011
    3
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    i have two camera
    sony cybershot dsc h20 and nikon coolpix p80 both are point and shoot camera and neither have hot-shoe nor external flash support!

    i want a circuit which trigger my external (Vivitar 1900) flash when i fire my builtin flash.

    here is the slave circuit, can you explain this?
    http://www.pbase.com/sinoline/digital_slave_trigger
     
  5. iONic

    AAC Fanatic!

    Nov 16, 2007
    1,420
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    From a quick qlance when light fall on a phototransistor, the 556 timer is activated causing a 50ms delay (low) followed by a
    250ms (high). It is "somhow" (as I am not sure of this section) processed and causes the SCR to output a 6V pulse. This may be the voltage that causes your Vivitar flash to be triggered. It sounds about the right voltage. In the end, its function is very similar to the circuit that Markd77 posted.
     
  6. owaisphotography

    Thread Starter New Member

    Jul 9, 2011
    3
    0
    thank you so much for your quick reply :)
    i will try this, but i am still confuse hope i can make this!
     
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