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telephone exchange
hello
please guide me that when a telephone receiver is picked up when it is ringing why high ringing voltage (e.g.90v) do not affect the remaing circuit
i think there is a problem with your DTMF generator so
try it with the nokia 1200 cell phone by connecting head phone to it. Turn on the keypad tone of your 1200 cell phone before testing and properly connect the head phone wires with your circuit if problem also exist then interchange these...
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