Circuit is made up of four parts: oscillation booster section, charging rectifier section, voltage indication section and pulse triggering strobe section.
When the power is switched on, by switching characteristics of transistor V1, form an intermittent oscillation, giving the T1 primary an alternating voltage. After being boosted by T1, give the T1 secondary an AC voltage greater than 300V. After being diodes D1 half-wave rectification, the alternating voltage turns into DC voltage, and charges the primary capacitor C2 and trigger capacitor C3. When the voltage is charged to around 70% of the nominal voltage, the neon lamp (Ne) of indicating circuit will build up of luminance, and the indicating strobe light is in a strobe standby state. When you press the button AN, trigger circuit (formed by R3 and C3, T2, and Xe) producing impulse voltage, secondary of T2 will response to instantaneous high pressure pulse. Through Xe flashing tube trigger electrode, nitrogen gas inside Xe flash tube ionizes and breakovers. Electric power stored on the capacitor C2 translates into luminous energy instantly by flash tube discharging, and completes a strobe.
Working principle of flashlight in the camera is as above. When the external scene's brightness is low, the camera's photometric system will emit information of low light. At this time, connect the flasher circuit for charger and flash manually or automatically by the camera. Some cameras also have automatic control system (auto-Flash) for flash to obtain more accurate exposure.
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