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...
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...
I think all these problems can be solved by using RC or wein bridge oscillator
at audio frequency. Thus replacing square pulses with sine waves.
10k will be replaced with 470 ohm at coupling path. What about my prediction ???
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)...