Slave flash - fast, sensitive and reliable

7-26 — elektor july/august 1982 slave flash Electronics have been making signifi- cant inroads into photography for some time now and, judging by the number of requests we receive, many of our readers want to push the frontiers even further. However, there are a few things that even we dare not do and dabbling with the insides of an electronic camera is one of them. One of the most repeated requests is for a flash slave unit and the super fast, super sensitive (and super insensitive) circuit here takes care of that. This can be used for any application of flash photography indoors as well as outdoors. The apparent confusion between super sensitive and at the same time super insensitive is easily explained. The slave unit is super sensitive to the master flash gun, but super insensitive to the ambient light conditions. It will react within about 10 ps depending on the light power of the master flash gun. This means that when using a computer controlled flash gun with a flash dura...