Hey all, I built the LPB from ggg:
(http://www.generalguitargadgets.com/v2/diagrams/lpb2_sc.gif)
I fiddled the part values though because I didn't have that much left.
R1 = 390k + 39k = 429k
R2 = 39k
R4 = 1k + 100 ohms in parralel with 560 ohms = 371 ohms.
The volume pot of my guitar is 20k. And still when I flick the switch, this 'booster' drops the volume by a lot! I checked the transistor (BC547C) pins, if I got the pinout correct it's:
C - 7.36v
B - 0.81v
E - 0.05v
I got it allready. Forgot to connect the circuit board ground to the guitar ground. Why do you have to connect all the grounds together??? Why is that?