Purple Plexi 800

The Purple Plexi is a powerful distortion pedal with plexi-style amps tone. It is very dynamic and touch-sensitive distortion, perfect for rock music.

Steps

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Designators and components Step 2 of 5

PCB DESIGNATORS

The original gain and volume controls have almost binary responses. Use the following component list for an improved version.

Capacitors
C1   390p   390PF 50V CERAMIC DISC CAPACITOR
C2   4.7n 4.7NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C3   100n   100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C4   47u   47UF 50V ELECTROLYTIC CAPACITOR 6X11MM
C5   47u   47UF 50V ELECTROLYTIC CAPACITOR 6X11MM
C6   4.7n 4.7NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C7   100n   100NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR

IC
IC1 LM386 LM386 AUDIO AMPLIFIER IC
(Socket 8 PIN DIP IC SOCKET)

Resistors
R1   2.2M 2.2M OHM 1/4W 1% METAL FILM RESISTOR
R2   10 10 OHM 1/4W 1% METAL FILM RESISTOR
R3   10 10 OHM 1/4W 1% METAL FILM RESISTOR
R4   470 470 OHM 1/4W 1% METAL FILM RESISTOR
R5   4.7k   4.7K OHM 1/4W 1% METAL FILM RESISTOR
R6   1.8k   1.8K OHM 1/4W 1% METAL FILM RESISTOR
R7   4.7k   4.7K OHM 1/4W 1% METAL FILM RESISTOR
R8   47k 47K OHM 1/4W 1% METAL FILM RESISTOR

Potentiometers
VOL 100K-A 100K OHM LOG POTENTIOMETER
FREQ 5K-B 5K OHM LINEAR POTENTIOMETER
GAIN 1K-C 1K OHM ANTI-LOG POTENTIOMETER

ORIGINAL COMPONENTS

Use the following components for the original version.

R8 330 330 OHM 1/4W 1% METAL FILM RESISTOR
VOL 100K-B 100K OHM LINEAR POTENTIOMETER
GAIN 1K-B 1K OHM LINEAR POTENTIOMETER

PCB

SCHEMATIC

PCB (Legacy DHB6v2)

GENERAL DESCRIPTION OF COMPONENTS

Resistors

Use a multimeter or the color bands to obtain the resistance value. Resistors do not have polarity, you can place them in any direction.

Electrolytic capacitors

Electrolytic capacitors have their value printed on them. The negative polarity pin is indicated by a white strip along the can. They also have a longer leg indicating the positive pin. The maximum voltage rating never can be exceeded, make sure you are using at least double voltage rating than your power supply. For example, if you are using a 9V power supply, use a electrolytic capacitor with at least 18V maximum voltage rating.

Polyester capacitors

Polyester capacitors have their value marked with three numbers. Read as picofarads (pF), the first two are the 1st and 2nd digits and the third is the multiplier code. These capacitors do not have polarity, you can place them in any direction.

Ceramic capacitors

Ceramic capacitors have their value marked with three numbers. Read as picofarads (pF), the first two are the 1st and 2nd digits and the third is the multiplier code. These capacitors do not have polarity, you can assemble them in any direction.

Integrated Circuits

Integrated Circuits (ICs) have their model printed on them. A notch half-circle or a dot indicates the correct position on the PCB.

Potentiometers

Potentiometers have their resistance value marked on them. They are marked with A, B or C for logarithmic, linear and reverse logarithmic, respectively.