Interesting looking at QA310 cct: it "only" uses 30V for the actual internal
trigger circuit.
It appears that the 220V on the trigger pin is needed, so the remote sensor can
duplicate the
internal auto (non-ttl) flash sensor functionality.
The 30V trigger circuit is isolated (AND'ed) via a diode from the 220V sensor
excitation.
Although the voltage is high , unlike really old high voltage trigger flashes,
the peak current at
the high voltage is very low since there is no high voltage capacitor on that
pin. Some of the old
Sunpaks,Metz etc have both a high voltage and a high voltage capacitor on the
pin. These are much
more likely to damage modern gear.
Tim Hughes
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