Slave Flash Trigger Circuit


Posted on Jun 25, 2012

This circuit (the Bucciarelli one) is designed to sense a sudden increase in light and does so extremely well. A few of these were actually built and tested and found to not trigger from normal room light. They sometimes malfunctioned if the phototransistors were aimed at fluorescent lamps at close range. They (units of the Bucciarelli design) have been known to sense even small camera flashes very reliably from 200 feet away and fairly reliably from 500 feet away. Your performance may vary depending on the qualities of your phototransistor and the brightness of the triggering flash. It is recommended to mount the phototransistor in a small, narrow tube to shield the phototransistor from bright light.






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