Distortion Plus

The Distortion + has the ability to generate various personalities of overdrive, distortion or fuzz, depending on the way you play the guitar. This popular pedal is one of the DIY classics.
Steps

Created by DHEA
Status: Active
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DESIGNATORS AND COMPONENTS Step 2 of 4

COMPONENT LIST

PCB
PCB   DISTORTION PLUS DIY PCB GUITAR EFFECT
Capacitors        
C1    1n    1NF 0.001UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C2    10n    10NF 0.01UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C3    47n    47NF 0.047UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C4    10p     10PF 50V MULTILAYER MONOLITHIC CERAMIC CAPACITOR
C5    1u    1UF 100V 105C RADIAL ELECTROLYTIC CAPACITOR 5X11MM
C6    1n    1NF 0.001UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C7    1u tant    1UF 50V RADIAL TANTALUM CAPACITOR
Diodes
D1    1N270    1N270 GERMANIUM DIODE DO-7
D2    1N270     1N270 GERMANIUM DIODE DO-7
IC        
IC1    TL071     TL071 OPERATIONAL AMPLIFIER J-FET PDIP-8 TL071CP
Resistors        
R1    1M    1M OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
R2    10k    10K OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
R3    4.7k    4.7K OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
R4    1M    1M OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
R5    10k    10K OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
R6    1M    1M OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
R7    1M    1M OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
R8    1M    1M OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
R9    2.2k     2.2K OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY
Potentiometers        
VOL    100k-A    100K OHM LOGARITHMIC TAPER POTENTIOMETER
GAIN    500k-C    500K OHM C500K 500KC ANTI-LOG TAPER POTENTIOMETER

 

PCB Front

PCB Back

MODIFICATIONS AND EXPERIMENTATION

The original circuit has two 1N270 germanium diodes. If you change the diodes you can obtain different distortion tones. The germanium diodes (1N60, 1N270 or 1N34A) will produce softer distortion, the silicon (1N914 or 1N4148) harder and the leds more fuzz and crunch. You can also experiment with different combinations (symmetric o asymmetric). Use sockets and easy change the diodes to find the sound you are looking for. You can install the sockets on the bottom side of the PCB. If you want to have a versatile pedal with a diode selector, you can use a 2PDT switch or rotatory selector.

If you are using germanium diodes and you feel the output doesn't have so much volume, you can put two diodes in series, that will increase your output level.

For more information about diode modifications please take a look at www.diystompboxes.com/cnews/mods.html