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Forum: Pentax Camera and Field Accessories
02-02-2008, 08:07 PM
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Thanks for the correction Lowell, I've only ever dealt with digital meters and wasn't aware that analog meters had problems with certain circuit types.
If you meant to be careful about my sync circuit, I'm not too concerned about it. I'm looking to use an optorelay rated at 400 volts DC with a 2ms or better response time (1/180 of a second sync = approx 5.5ms). The relay is rated for significantly more abuse than I intend to submit it to, and I've got an electrical engineer around to double check my math plus a couple of scrap flashes around to test the circuit on before trying it out in the real world.
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Forum: Pentax Camera and Field Accessories
01-30-2008, 11:06 PM
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Well, here's the standard link for checking appoximate trigger voltage values: Photo Strobe Trigger Voltages
Unfortunately, the Vivitar 225 isn't listed. If you can't get an answer here or borrow a multimeter from a friend, it might be worth spending $5-10 for a cheap multimeter to check the flash yourself.
The 225 is an old enough model that there is a good chance it has too high a trigger voltage to be used on your camera safely, though on a remote trigger I don't think it's as much of a problem.
I'm currently in the process of sourcing parts to build a circuit that will lower the sync voltage on my old Vivitar 3500, but haven't finished the design yet (buying a proper safe sync module would cost several times more than my flash is worth).
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