Safe Flash Trigger Voltage (Nikon)
 

I've been trying to find a definitive answer on what voltage is safe to use on my D40X.
I've looked around quite a bit online and so far I've found people have said 6, 12, 20, and 250 volts. Does anyone have any reliable info for which is actually the case? (couldnt find anything in the manual about it either)
Why not just buy the fancy new nikon units you might ask?
Because I'm just playing around with this sort of thing casually and am on a working 1 day a week student budget, because I got a Vivitar 3700, 2 2800's, a 2600, and a 16A, all for a Venti Starbucks coffee, so it would be nice to be able to put one of them to use (I've got remote triggers inbound for the rest)

No, definitely not 250 volts!

^it might actually be, after lots of looking through their website (their search function is useless) I found:

"Warning: Negative voltages or voltages over 250 V applied to the camera's sync terminal could not only prevent normal operation, but may damage the sync circuit of the camera or flash. Check with the strobe manufacturer for voltage specifications."

http://help.nikon.ca/app/answers/det...0v/r_id/116679

(granted I could be mis interpreting the info and that AS-15 unit could drop the voltage between the flash and the hot shoe)