I bought a Guitar Fuel preamp kit, which I want to use to drive a speaker. The blurb on this ebay item Page says you can easily add an extra 9V battery, but I cannot find instructions on how to do so. Can anyone advise me on how to do so? I just thought I'd ask here first, but I must add that guitar fuel are most helpful with this sort of thing before anyone gets the wrong idea about them. 

All the best from Bill. :D

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I just presumed it gave a longer running time?
Oops -- preamp... Should run forever on a 9v, though some circuits you can install in the guitar and run on power over the guitar cable... Google Tillman FET preamp...
Okay, Thanks guys.
All the best from Bill. :D
Thanks for the input 'Finder. I'm looking elsewhere right now anyway, I had seen some very competitively priced self build kits from China.
All the best from Bill. :D
Thanks mate, I appreciate the input. I was looking for something a bit out of the ordinary, and a bit more of a challenge build wise. I'm on the iPhone ATM, but I'll send you some details later on. This is a self build hi fi preamp circuit that i pulled the trigger on in the end. At £13.50 I thought it was worth a go, just as an experiment really.
Incidentally the Guitar Fuel kit I bought previously wasn't as expensive as that . . . Not sure if I remember right or not . . . It was a good kit though, I liked that it had stacked pots.
All the best from Bill. :D
Update on the Guitar Fuel Kit:- it works well on mini speakers especially. You turn up the bass and turn down the treble and it takes off the harsh overtones on the high notes.
All the best from Bill. :D

Looked at the GF description & looks like you have to by the upgraded board that runs on higher voltage to use the 2 battery setup. The preamp is designed to operate between 6 and 22v. But as is, in the basic form, 9v is appropriate.

One thought, you mentioned this was to drive a speaker. A reasonably priced amp board would do better. Both in signal/sound quality but also able to drive large speakers much better than a preamp alone.

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