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Camera internal flash circuit

2017-02-05 19:00  
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Camera internal flash circuit
This circuit is composed of the light measurement circuit and the flash circuit, as the figure shows. It can be used in the POPTICS (one kind of popular integration camera), the Franka X-500 and the WIZEN-860S cameras. It is composed of the following circuits: (1)the light measurement circuit is composed of the VT1, VT2 and the light metering component RG (use the cadmium sulphide CdS photoconductive resistance). (2)the electrical inductance three-point oscillator circuit is composed of the VT3, C1, T1, this circuit completes the transformation of DC low voltage→AC high voltage→DC high voltage to supply power for the flash light. Components selection: the VT1 and VT2 use the C945 type transistor; the VT3 uses the D965 type transistor. The LEDl uses the Φ55mm red LED, the LED2 uses the Φ55mm green LED and the LED3 uses the Φ55mm yellow LED. The RG uses the CdS photoconductive resistance. The other components are as shown in the figure.