A demonstration of my killswitch...I also demonstrate the "pop" that many of you have questions about.
Disclaimer: I am not responsible for any damages that may occur while modifying your guitar. This is merely a guide. If patience is utilized, then no damage will come.
Step 1: What is a killswitch?
The basic concept of my killswitch design is to create a circuit in which the output signal can reach the ground. When the circuit is completed (by pressing the switch), there no sound is heard.
IMPORTANT: Simply putting an on/off switch on the outgoing signal wire is VERY BAD. The resulting sound is that of when you unplug or plug your guitar in. That annoying buzz.
Source - http://www.stinkfoot.se/andreas/diy/mods/killswitch.htm
The popping sound is normal, due to the physics of the killswitch. Adding resistors and capacitors wont do anything. Source - http://alexplorer.net/guitar/mods/killswitch.html