Hi, Michael,
Quote:
Originally Posted by michaelnotar  all current flashes need to have a trigger voltage of 9v or less i believe so it would probably fry the transistor on the camera. |
There is no chance that a sync circuit voltage of over 9V would "fry" the transistor of the camera. In fact, for most contemporary Canon cameras, there is essentially no sync circuit voltage that would "fry" anything - their electronic sync circuits have overvoltage protection.
Please see Chuck Westfall's information in the referenced thread.
The old 6V limit was not actually based on any possibility that a higher voltage than that would damage the electromechanical sync contact on the camera shutter. Rather, it was really a "litmus test" to distinguish (not well) between two designs of flash unit sync circuit:
A. Where the sync contact of the camera directly discharged a capacitor into the trigger transformer.
B. Where the sync contact activates an electronic switch in the flash (SCR typically) which discharges a capcitor into the trigger transformer.
Type A is bad for electromechanical camera shutter contacts not because of the voltage but because of the peak current that design almost inevitably involves.
The "voltage limit" was a clever ploy to allow users to avoid Type A circuit flash units (without having to know the circuit details), since almost inevitably the sync circuit voltage there was (substantially) higher than 6 volts (and for type B, it was often less than 6 V).
Best regards,
Doug
Linear Mode
