What is the principle of flash?

Basic principle: the low-voltage DC is converted into high-voltage (160V-300V) alternating current by a transistor oscillating circuit, and then rectified into high-voltage DC to be stored in a capacitor, and this high voltage is applied to both ends of the flash tube; Similarly, another high voltage (about 800V) is generated. When taking pictures, this high voltage (800V) is applied to the trigger end of the flash tube, so that the gas in the flash tube is broken down and conducted, and the electric energy in the capacitors at both ends (voltage 160V-300V) is discharged through the flash tube, so that the flash tube emits light. Because the stored electric energy is limited, the flash tube can only keep emitting light for a very short time (about 1000 of a second).

Now some other control circuits are added to the flash.