Helpful resource: Strobe Trigger Voltages

[k9mom]

Don't know if this has been posted before, so excuse the redundancy if it has.

This is a fairly comprehensive list of external fashes (strobes) and their measured trigger voltages. A lot of DSLRs and electronic 35mm cameras can't handle the high trigger voltages of some older model flashes (for ex. most EOS DSLRs have a hot shoe max trigger voltage tolerance of only 6V), so this list is good to consult before buying that used Vivitar 283 which could fry your camera. Some radio triggers, such as the YongNuo RF-602 require flashes with a max trigger voltage of 12V or less...

Photo Strobe Trigger Voltages