New! Sept 2020: Courtesy Forum member Purge (David Blair)
Original Printed Circuit Board
Top and Bottom (click to enlarge)
CLICK HERE for connection details to the pots and switches for the original PCB
Revised PCB foil pattern | mirrored
This one is two thirds the size of the original.
It can easily be soldered straight onto the terminals of the on/off switch
CLICK HERE for more information on PCB making
Components Identification
Component list
C1, C3 1uF 50v electrolytic
C2 10nF Mylar
Resistors (All 1/4W 5%)
R1 – 47K R2 – 470K
R3 – 270R
R4 – 10K
R5 – 100K
R6 – 68K
Q1 – 2SC1327 (Obsolete, may be hard to find)
External connections 1 – earth 2 +9v 3 – input 4 – output
Testing
- Set the switch to the off/bypass position
- Set amp gain and volume as low as they will go, so you can only just hear the guitar
This is to prevent possible damage to the amp – and your hearing, the circuit gives a ludicrous amount of boost! - Connect the battery (Single PP3) and turn the booster on
To reduce the level of boost alter the value of R6 (68k) — lower values give less boost.
It is strongly recommended to replace R6 with a 20k/22k resistor and 47k pot wired in series to give variable boost