555 camera flash delay circuit

Published:2011/5/23 2:46:00 Author:TaoXi | Keyword: camera, flash, delay circuit | From:SeekIC

As the figure 17-1 showns, the camera flash delay circuit can be used to capture the high-speed scene, and you can get a very short exposure time. The light door is composed of the luminous diode and the 3DU type photosensitive tube. When the light is shadowed, the positive transition pulse adds to the VT2. The IC1(555) is triggered by the low-level pulse, 555 sets, pin-3 has the low electrical level, VT3 conducts, SCR conducts too. The monostable timing circuit is composed of the IC1 and RP2，R4，C2, the temporary stabilization time td=1.1(RP2+R4)C2.



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