The TV auto brightness adjusting circuit composed of LDR

Published:2011/6/15 20:31:00 Author:Borg | Keyword: brightness adjusting circuit | From:SeekIC

The TV auto brightness adjusting circuit composed of LDR See as the figure, the LDR is connected with the middle head of the contrast potentiometer. By the LDR feature that its resistance changes with the brightness of the rays, the LEV on the middle head of the potentiometer changes with the brightness of the rays, then by the control of decoding circuit TA7698AP, the brightness, contrast ratio and saturation of the TV change accordingly. When the rays are bright, the resistance of GR is low, and the LEV on the middle head of the potentiometer is rising.



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