The luminous flux adjustment equipment circuit of light dependent resistors (LDR)

Published:2011/5/23 3:55:00 Author:Borg | Keyword: luminous flux, adjustment equipment circuit, light dependent resistors | From:SeekIC

This is a luminous flux adjustment equipment circuit of light dependent resistors (LDR). This circuit is used to measure the luminous flux on the LDR, and adjusts it. If the luminous flux is growing, then the resistance of RG is decreasing, and the base LEV of VT1 and VT2 is rising, finally, VT1 is conducting and VT2 is blocked. At the moment, as VT1 and VT2 are Schmidt circuits, therefore, VT3 becomes conducting. Then the relay of KI takes action and its terminal of KI-I links with the power supply, and the motor runs, the silt is adjusted to make the luminous diminish. When the luminous flux reaches the regulated value, VTI is blocked and the motor stops running.



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