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ring detection output -plzz help!

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theEgO

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hello,
can some1 suggest any ring detection circuit which can give out a logic level signal.
i am using the one with the optoisolator. this one can give out a signal that fluctuates according to the rings. i need a circuit with good logic output signal to drive a flip flop.
plzz help..
 
I have not done a rigerous analysis of this circuit, but I think it works.
 

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