Un-solder the out wire from the centre terminal of the volume pot, this wire runs down to the output jack connect the yellow output wire from the pre-amp to this wire, then connect the white input wire from the pre-amp to the centre terminal of the volume pot. Connect the red positive wire from the pre-amp to the red positive wire of the battery snap, remove the output jack from the to guitar and replace it with a stereo Jack (ring tip sleeve) connect the ground wire back to the sleeve terminal, connect the output wire to the tip terminal, now connect the black negative wire from the battery snap to the ring terminal. This way the pre-amp will be switched off whenever the guitar lead is unplugged.
Volume and Tone pots with switches built-in that operate by pulling their knobs in and out are available for guitars, these plots with switches are a good method to include a bypass switch and power switch as shone in wiring diagram 2.
The Activator Guitar Pre-Amp can be housed in a metal box and used as a DI UNIT for Sound Blaster type Computer Audio Cards as well and is excellent for this application. Make use of a stereo Jack (ring tip sleeve) for the input from the guitar and connect the black negative wire from the battery snap to the ring terminal, mono phone jacks can be used for the outputs to the Sound Blaster and Guitar Amplifier. See diagram 3.
This Activator Guitar Pre-Amp will lower the impedance in long guitar leads to reduce guitar lead hum, it can also be used to take full advantage of extra headroom available or to overdrive a Guitar Amplifier. The output can be adjusted to your optimum level with the pot on the board.