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    HOME AUTOMATION USING PHONE (DTMF TOUCH-TONE)

    Here I am presenting my final mini-project setup. See the attachment in this forum or the link... http://www.scribd.com/doc/29233455 I express my sincere thanks to all forum members for there great support without whom this project wouldn't have been a reality. Still I am welcoming new ideas...
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    some weird effect of Telephone DTMF MT8870CE !!!

    Look up the attachment . http://www.scribd.com/doc/27392525 When power up the circuit all LED s 1 to 4 turned-on (I expect all turn-off). The problem is that, When I calling from remote end all the LED s blinking randomly for 1 sec (undesired result) and then  comes to a stable state. But...
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    Efficient telephone audio (300-650Hz) fedback mechanism !!!

    Can anybody suggest any efficient audio fed-back mechanism through telephone line so that the telephoning person can hear audio beeps, by which he can check the status of remotely controlled device (teleremote control). I have tried two circuits (see two attached files)...
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