I have been a subscriber to EFY for the past two years. The circuits published in EFY are quite interesting. I have assembled some of the circuits as hobby projects. These are working well. Now, I have chosen the 'Cellphone Operated Land Rover' published in July 2008 issue as my academic mini project. I have all the components required for this project. The PCB is ready and I have started soldering the project. However, I couldn't understand how to connect TIP and RING labels (shown at the input of the circuit) using the headset of the cell phone. Please help me.