http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008-12-02T00:09:02-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t9954.html 2008-12-02T00:09:02-08:00 Tip and Ring are telephony slang for the two wires which make up the electrical circuit used for telephone wiring.But from the telephone jack there are 8pins .How to detect which one is tip or which one is ring.