Watch the The Edge online guitar lesson by Jeff McErlain from Kings of Tone
There are many delay pedals to choose from out there. The Edge started off using the Electro Harmonix Deluxe Memory Man, this is a great classic analog delay pedal with the added chorus feature on the delay repeats. This box is one of the best sounding delays you can find, especially if you get an older one. The originals did not have a tap tempo function so getting the delay times to be in sync with to a song is a challenge. EH has a number of reissues out that are quite nice. For the Edge sound I would highly recommend a delay with a tap tempo function such at the TC delay I am using in the course. Still not sounding like the Edge? Don't sweat it, on the 360 tour he had 43 different rack units and pedals in his set up.