Phone in use circuit not working

Started by steve in sci.electronics.basics10 years ago 46 replies

I tested and built the following circuit. http://www.circuitstoday.com/telephone-in-use-indicator It all worked fine untill I tried to test...

I tested and built the following circuit. http://www.circuitstoday.com/telephone-in-use-indicator 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 devic...