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| Flash slaves are used when you need to supplement one flash unit with one or several more. This slave trigger simply triggers those other units. It does this by "seeing" the first flash (using a phototransistor) and triggering the other flashes a few microseconds later. The sensitivity of the circuit is adjustable to compensate for ambient light or dimmer than usual master flashes. |
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| I wonder if R3 would not be more appropriately connected to the ground rather than on the Q2 collector . Q2 would working in pure switching ... | ||
| does not work | ||
| R5 - 680 ohm will do just fine with a (SCR1) TIC 106 a good sensitive contruction, ;) but only the first flash trigger this circuit. most camaras give two, or use manual mode on the camara. then you have to think again, but the digital cam give a preview. this way you can make a other picture. . | ||
| How much power supply I shoud give it? | ||
| R5 please...you owe us that much
(Editor's notes: Search the forum.) |
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| Is it possible to use the trigger voltage of the flash unit to power the trigger instead of using a separate 9V cell? If so, how do we go about this? | ||
| tip: dont construct a circuit before verifying all parts.;) | ||
| What's the value of R5? (Editor's notes: Search the forum (or for just read prior comments).) |
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| The exact value of R5 depends on the SCR being used. Try 4K7 (that's 4.7K in old money) as a starting point. If your SCR doesn't fire then reduce until it does reliably. | ||
| Thanks, been looking for something like this online for ages. NOw I can cheaply and easily make a slave trigger for my "disposable" flashs..... | ||
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