PURPOSE: A circuit for controlling current of a infrared light diode equipped with camera detecting amplitude of light is provided to extend image pickup distance with a minimum power by controlling a current flowing in a infrared diode included in a surveillance video according to the light intensity.;CONSTITUTION: A light sensing sensor is included on a camera. A transistor transmits a collector current to IC. A signal input to the IC is quantified by a detecting unit. An output of comparator controls a current of an infrared diode. An image pickup distance extends when a current flux in an infrared diode increases.;COPYRIGHT KIPO 2012
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