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How the Flash Works
Nov 26, 2018

Normal flash refers to the flash output of the energy is an adjustable flash, that is, the Flash's nominal flash index GN is a constant value. The circuit consists of four parts: the Oscillation booster part, the rectifier charging part, the voltage indication part and the Pulse trigger flash part. When the power supply is switched on, the switching characteristics of the transistor V1 are used to form an intermittent oscillation, so that the primary of the T1 obtains a alternating voltage, which is T1 boost, so that its secondary acquisition of alternating voltage greater than 300V. The alternating voltage becomes DC voltage after the diode D1 half-wave rectifier, and the main capacitance C2 and the trigger capacitor C3 the charging energy storage. When the voltage is charged to about 70% of the rated voltage, indicate that the neon (Ne) in the circuit is shining, indicating that the flash is in a normal flash waiting state. When the button an is pressed, the trigger circuit (consisting of R3, C3, T2, and XE) generates a pulse voltage, the secondary induction of the instantaneous high pressure (about 10kV) pulse in the T2, through the XE flash tube trigger pole so that the XE flash tube nitrogen ionization and guide, the capacitance C2 stored on the energy instantly through the flash tube discharge into light energy,

Complete a flash. The inner-hidden flash in the camera works as above. When the brightness of the outside scene is insufficient, the camera's metering system emits a low-picture message, which is charged and flashed manually or by the camera automatically connected to the Flash circuit. Some cameras also have systems that automatically control the amount of flash (automatic dimming flash) for more accurate exposure.


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