Dr Boogie Distortion

PCB DESIGNATORS

Resistors        
R1     2.2M     2.2M OHM 1/4W 1% METAL FILM RESISTOR
R2     1M        1M OHM 1/4W 1% METAL FILM RESISTOR
R3     68k       68k OHM 1/4W 1% METAL FILM RESISTOR
R4     1.8k      1.8K OHM 1/4W 1% METAL FILM RESISTOR
R5     2.2M     2.2M OHM 1/4W 1% METAL FILM RESISTOR
R6     680k     680K OHM 1/4W 1% METAL FILM RESISTOR
R7     470k     470K OHM 1/4W 1% METAL FILM RESISTOR
R8     1.8k      1.8K OHM 1/4W 1% METAL FILM RESISTOR
R9     470k     470K OHM 1/4W 1% METAL FILM RESISTOR
R10   1M        1M OHM 1/4W 1% METAL FILM RESISTOR
R11   3.9k      3.9k OHM 1/4W 1% METAL FILM RESISTOR
R12   330k     330k OHM 1/4W 1% METAL FILM RESISTOR
R13   220k     220K OHM 1/4W 1% METAL FILM RESISTOR
R14   1.8k      1.8K OHM 1/4W 1% METAL FILM RESISTOR
R15   10k       10K OHM 1/4W 1% METAL FILM RESISTOR
R16   4.7k      4.7K OHM 1/4W 1% METAL FILM RESISTOR
R17   2.2k      2.2K OHM 1/4W 1% METAL FILM RESISTOR
R18   100       100 OHM 1/4W 1% METAL FILM RESISTOR
R19   100       100 OHM 1/4W 1% METAL FILM RESISTOR

Capacitors        
C1    100n     100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C2    220p     220PF 50V CERAMIC DISC CAPACITOR
C3    22n       22NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C4    2.2n      2.2NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C5    1n         1NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR 
C6    22p       22PF 50V CERAMIC DISC CAPACITOR
C7    220p     220PF 50V CERAMIC DISC CAPACITOR
C8    22n       22NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C9    1u         1UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C10   22n       22NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C11   220p     220PF 50V CERAMIC DISC CAPACITOR
C12   1u         1UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C13   220n     220NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C14   6.8n      6.8NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C15   220n     220NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C17   33n       33NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C18   100u     100UF 35V ELECTROLYTIC CAPACITOR 6X11MM
C19   100u     100UF 35V ELECTROLYTIC CAPACITOR 6X11MM
C20   4.7n      4.7NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C21   100u     100UF 35V ELECTROLYTIC CAPACITOR 6X11MM
C22   1u         1UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR

Transistors
Q1    J201          SMD SOT-23 J201 JFET N-CHANNEL TRANSISTOR
Q2    J201          SMD SOT-23 J201 JFET N-CHANNEL TRANSISTOR
Q3    J201          SMD SOT-23 J201 JFET N-CHANNEL TRANSISTOR
Q4    J201          SMD SOT-23 J201 JFET N-CHANNEL TRANSISTOR
Q5    J201          SMD SOT-23 J201 JFET N-CHANNEL TRANSISTOR

Diodes
D1    1N4001      1N4001 DIODE 1A 50V

Trimmers
BIAS1   100k      100K OHM TRIMMER POTENTIOMETER CERMET 1 TURN
BIAS2   100k      100K OHM TRIMMER POTENTIOMETER CERMET 1 TURN
BIAS3   100k      100K OHM TRIMMER POTENTIOMETER CERMET 1 TURN
BIAS4   100k      100K OHM TRIMMER POTENTIOMETER CERMET 1 TURN

Potentiometers
GAIN      1M-A       1M OHM LINEAR POTENTIOMETER
VOL        100k-A    100K OHM LOG POTENTIOMETER
PRES      10k-B      10K OHM LIN POTENTIOMETER
BASS      100k-A    100K OHM LOG POTENTIOMETER
MID        2.5k-B     (5K OHM Lin POTENTIOMETER with parallel 5.1k OHM 1/4W RESISTOR)
TREBLE   25k-A      25K OHM LOG POTENTIOMETER

PCB  Dr Boogie Distortion

SCHEMATIC

POTENTIOMETERS

The 2.5k-B MID potentiometer can be hard to find. If you can't find it, solder a  5.1K OHM RESISTOR to the 5K OHM LIN POTENTIOMETER as follows.

BIASING

Use the trimpots to adjust the bias voltage of each stage. Use a multimeter to measure 4.5V at the test pads (BIAS1, BIAS2, BIAS3 and BIAS4).

TRANSISTORS

You can use either through-hole or SMD transistors. The PCB is designed for JFET transistors (J201, 2N5457, 2N5458, MPF102...) with the pinout as shown in the following figure.