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Friends: I am using LCA110 chip to connect phone line for realizing hook-off function in a system design. The hook-off circuit is included two transistors and few capacitors. One transistor's emitter has been connected to the ground by 1UF poly capacitor. Pin2 of the LCA110 is set to logic 0 by 8051. The wired thing is when Pin2 of the LCA110 is set to 0; few seconds later, the noise is coming out. What are the possible reasons for it? Thank you for your suggestions.