For those of you that don't know what a guitar kill switch is, it's basically a momentary switch, that when pressed, stops signal from going out of the guitar and going into the amp. Basically, when the button is pressed, there is no noise. Les Paul players usually achieve this effect by setting one pickup's volume to zero, and switching back and forth between pickups, creating a stuttering effect. However, this cannot be done on a Strat., since there is only one volume potentiometer.
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