I'm building a DIY pedal effect for my electric guitar and I have to connect the input and output jack connector, but I don't know how to do it. The connectors have 3 pins, one is the tip which it is connected to the tip of the male jack and one I guess it is the ground, but I don't know how to connect the third one. My question is: can I use two mono jack input? In internet I saw stompbox with only one mono jack as output and one stereo jack as input. If yes, how do I have to connect them?
Have you studied the relevant wikipedia page ?
All the way down at the bottom right is a picture which shows you how to connect 6.3 mm stereo and mono jacks.