Slave flash trigger is a circuit for triggering external flash without physical connection to your camera. Triggering is accomplished by light from the flash on your camera.
I used quick response components so that there is no noticeable delay between master and slave flash. On compact camera I can use shutter time up to 1/1000 of second.
List of material
- Resistor 10k Ohm
- Resistor 33k Ohm
- Capacitor 100nF 100V
- Thyristor C106
- Silicon NPN Phototransistor BPY 62-2 or BPY 62-3
- 9V battery snap connector
- hot shoe for slave flash
- prototyping PCB board
Flash units may have lethal high voltages on the terminals. Be extremely careful when working on something like slave flash trigger.