I tested and built the following circuit.
It all worked fine untill I tried to test it by calling into my phone. (the one test I didnt do before I soldered it all together)
What happens is taht the phone rings for a about 1/2 a ring then stops ringing. To my surprise when I life the phone up the line is alive eg. Its like the device has answered the phone.
I think that the circuit must be drawing too much power and then telling the phone that it has been answered, because the voltage has gone down.
I have had to replace the Transistors with NTE199, which according to the book are the same. I have also used a rectifier that is a 2 amp 400v SIP 2KBP04M-1. Im wondering if I used a different rectifier if that would change the results?
I recognize that your not suppse to take power from the phone co. but I would like to get this circuit working. Can anyone tell me why its not working. thanks.