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new to electronics. need help understanding a circuit

Discussion in 'General Electronics Discussion' started by cvangordon, Mar 28, 2016.

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  1. cvangordon

    cvangordon

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    Mar 28, 2016
    So I've been trying to figure out how to build a flash to make an external flash unit for a camera. I have learned a lot about electronics and especially about how a basic flash circuit works but am still trying to figure out some basics as I have no background education toward electronics whatsoever. Hasn't even been a hobby until now.

    I looked up a lot of info online and figured out how most of a flash works but I'm still figuring out how some of the other parts work.
    http://www.diyphotography.net/how-to-build-a-flash-with-an-optical-slave/
    In this article here it explains how major parts work and then says the other parts in the circuit are fixed components and doesn't explain what they are doing. That just so happens to be the part I would like to know.

    I'm guessing that the trigger transformer in the circuit still needs an AC current to work and that is the purpose of the other transistor? I know the other capacitor is there because the trigger transformer has an input voltage of a few hundred volts.

    My ultimate goal is to make a basic flash like this but with an LED indicator light for when the main capacitor is full and not to have it triggered optically but with a hotshoe that can be connected either the the camera or with a remote trigger. But for now just trying to increase my understanding of this type of flash. Help is much appreciated. :)
     
  2. Alec_t

    Alec_t

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    Jul 7, 2015
    Welcome to EP!
    This is NOT a project for someone new to electronics. The slightest error could be FATAL.
     
    davenn likes this.
  3. davenn

    davenn Moderator

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    Sep 5, 2009
    agreed

    highly dangerous for someone who admits to being new to electronics

    pick on something easier and much lower voltage for your earlier projects
    and learn to walk before you run

    thread closed
     
  4. davenn

    davenn Moderator

    13,802
    1,941
    Sep 5, 2009
    We not being able to supervise you directly, have no idea if you really know what you are doing or not.
    You plainly stated your inexperience and this is enough, considering the high voltage capabilities of this circuit to warrant us to close the thread
    None of us here want to be responsible for you not following instructions carefully and being involved with your or someone elses death or injury
    We have to consider the legal ramifications if someone in your family sued us individually or collectively because of your death or injury .... Its the world we live in
    we have to protect ourselves from litigation

    Dave
     
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