Can I trigger two or more flash units simultaneously from one output of a trigger circuit?
Yes, this is possible with some flash units. One method is to connect the flash units in parallel across the output. We’ve used this method with as many as 10 Vivitar 283s. This works best if using all the same make/model of flash. It’s not recommended if using different flash units, and it’s possible that it won’t work for some models. And here’s something to be especially careful of. There are two different version of Vivitar 283s; the older version has ~300 V across the flash terminals. Connect one of these in parallel with a neter version that has ~10 V and you could have problems. Another method which gets around the possibilty of one flash’s trigger circuit affecting anothers is to use wireless transmitters and receivers, such as PocketWizards. Connect a transmitter to the output of the trigger circuit. Then put receivers on the flashes that you want to discharge simultaneously. If wireless transmitters are too expensive for your budget, use the output of the trigger circuit to d
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