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View of a disassembled flash unit. The cylindrical xenon flash tube is shown on the left in its reflective housing. The capacitor (large, black cylinder) that stores energy for the flash discharge has been disconnected and is shown in the middle foreground.  Other components associated with triggering the discharge and providing electrical power are shown on the circuit boards. Caution: Don't disassemble a flash unit yourself, Could cause serious injury or death from electrical shock.