Slave Flash for Digital Cameras
Although most digital cameras have a built-in flash, a connection for an external flashlight is rarely seen. Still, on some occasions it’s useful to have just a tad more light and that’s why we propose a simple add-on.As many of you will be able to avow, the light capacity of the flash facility on low-cost digital cameras is often marginal if not insufficient. Problems typically occur where the object to be photographed is too far away, or if a (very) short shutter time is required. In those difficult cases, the slave flash we’re about to describe may come in really useful.The idea is simple: detect the flash from the camera and use it to trigger a powerful external flashlight with the aid of a thyristor.