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Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Trying out my new slave flash. It's a disposable camera flash board with an external switch soldered onto it. I'm going to build an optical trigger for it but right now I'll have to manage with finger sync.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
First Spark Photos! (at least, first planned ones) - subject being electrocuted is one of our Junior Class Rings, the texture of which offers a very nice spark patter in in the engravings...
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
Dr. 2N3055 wrote ...
Another high speed pic. This one came out pretty well, I think. *wanting to build a sound trigger
pretty nice! A good way to make those even nicer is to use a clear container, allowing you to see the full event, or a downward sloping shot for a better view of the entire crown... and sound triggers are not the best for water shots, as the sound can be unreliable to set off your trigger, or it is too sensitive and goes off when not wanted. however, a basic sound trigger can be used in another fashion that works much better: use a piezo element, a potentiometer, a 9V, a basic NPN, and an SCR and you have a sound trigger! (the potentiometer is used to make the battery voltage varied to the NPN, such that the voltage produced by the Piezo will turn it on, and it will turn on the SCR which remains on until the flash is used up) - a good way to make this work with water is to have the opening of the Piezo attached to the bottom, or sides but I have not tried those, of the liquid container... add a microcontroller and you've got a delay unit as well (I have seen those made with 556s, but I doubt that they are good for anything other than "slow" high speed events)
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