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From: email@example.com (Gregory L. Hansen)
Subject: Re: Camera Flashes
Date: Tue, 3 Dec 2002 17:05:44 +0000 (UTC)
Organization: Indiana University, Bloomington
References: <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: Tue, 3 Dec 2002 17:05:44 +0000 (UTC)
X-Newsreader: trn 4.0-test62 (21 February 1998)
In article <firstname.lastname@example.org>,
John Muchow wrote:
>>>>Well, all the camera will see is a nine volt battery feeding the gates of
>Perfect. And very similar to what I did with a similar circuit a few
>years ago. I had to parallel up to twelve 2400WS Speedotron flash
I've called Vivitar with some technical questions, and only succeeded in
making the representative uncomfortable. Maybe you can help.
The flash really is triggered by shorting the PC cable, right? I can fire
it by shorting the connector, and it works fine when the PC cable is in my
camera, but if I manually short the end of the cable nothing happens. I
really don't know why.
What kinds of voltages and current would be running down the cable for an
old flash like the Vivitar 2600 or 2800? The rep said something about 150
volts, but I find it hard to believe there's 150 volts across the signal
and ground of the cable and being fed into the camera.
How does the hot shoe work? I can slide the flash unit into a metal
bracket and it won't fire, so it seems the shoe mount isn't triggered by
shorting the connections. Is there some voltage applied across the
terminals? I didn't want to experiment too much for fear of putting too
much voltage the wrong way through it.
"A nice adaptation of conditions will make almost any hypothesis agree
with the phenomena. This will please the imagination but does not advance
our knowledge." -- J. Black, 1803.
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