How can I make a redstone signal go more than 15 blocks?

Currently, I'm limited to using at most 15 blocks of redstone. Is there a way to bypass this limit? I dont want to use Wireless redstone because I want to see what is connected to what. Would be nice if someone knows how to disable the limit without writing the whole redstone engine again!

Solution 1:

There are a number of methods for extending a redstone signal:

Repeaters

Just plonk down repeaters. Each one gives you another 15 blocks, however, there is a 1-tick delay in the signal for each repeater you use, which can slow down large circuits.

Instant Wire

This allows for instantaneous redstone transmission over long distances. There's a wiki page for it! It's a little complex, so here's video:

Should the video go down, a search for Instant Wire will turn up many more.

Mods

MineFactory Reloaded has redstone wiring that can extend for supposedly unlimited distance, preserving signal strength, using a network system.