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Old Feb 9, 2007, 10:04 AM   #11
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I may be incorrect , but I think Fuji fit a safety circuit into their cameras now. Using a 400v SCR.
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Old Feb 9, 2007, 10:49 PM   #12
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Thanks Geriatric, Fuji rate my camera as capable of a 400v hit, and my flash trigger voltage has measured 400v. I think I would be pushing my luck without adding some other protection.
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Old Feb 9, 2007, 10:52 PM   #13
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Thanks for the circuit, I will investigate using it. I am not yet sure how to integrate it into my flash unit
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Old Feb 10, 2007, 4:36 AM   #14
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Hi

There are much simpler circuits available for the DIY members.
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Old Feb 10, 2007, 11:51 PM   #15
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Hello

Where do you find the simpler circuits?
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Old Feb 11, 2007, 3:54 AM   #16
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Send me your E mail and I will send youa few
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Old Feb 11, 2007, 3:59 AM   #17
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Old Feb 12, 2007, 4:17 AM   #18
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yes, there are simpler circuits,like this one, that does not require any external power,and can be put even in a small box on the cable that goes from the hot shoe to the flash(if there is no room inside the flash)

but at the previos circuit i build it because i was using a 220V flash and i used 2 or 3 flashes at the same time, and i neded galvanic separation betwen the flashes...(this one probably wolud have worked,but i didn't whanted to take any chances,because ov more than one flash, also flashesware diferent models)
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Old Feb 13, 2007, 1:51 AM   #19
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Your simple circuit shows the trigger voltage on the same line as the camera hotshoe. Very dodgy, if the zener diode fails, the full potential will be applied to the camera :?
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Old Feb 13, 2007, 4:24 AM   #20
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geriatric wrote:
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Your simple circuit shows the trigger voltage on the same line as the camera hotshoe. Very dodgy, if the zener diode fails, the full potential will be applied to the camera :?
zeners don't usualy fail.. ia have hardly seen a zener dead...extreamly rare,and caused by exesive curent....witch is not posible in this case..te 6M ohms rezistor will limit the corent to ~50uA or less...and even if they fail the diode is usualy shorted, so it acts as a wire conductor, i had only seen once that a zener failed and it didn't shorted..


so, let's see What circuit you had in mind...:arrow:
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