RAT

This is the RAT, one of the most popular distortion effects from the 80´s. It performs very nice high-gain distortion suitable for metal, grunge or rock.
Steps

Created by DHEA
Status: Active
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Designators and components Step 2 of 5

COMPONENTS

PCB
1 x  RAT DIY PCB
Capacitors
C1    22n 22NF 0.022UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C2    1n 1NF 0.001UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C3    30p 30PF 50V CERAMIC DISC CAPACITOR
C4    100p 100PF 50V CERAMIC DISC CAPACITOR
C5    4.7u 4.7UF 50V 105C RADIAL ELECTROLYTIC CAPACITOR 5X11MM
C6    4.7u 4.7UF 50V 105C RADIAL ELECTROLYTIC CAPACITOR 5X11MM
C7    4.7u 4.7UF 50V 105C RADIAL ELECTROLYTIC CAPACITOR 5X11MM
C8    3.3n 3.3NF 0.0033UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C9    22n 22NF 0.022UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C10    1u 1UF 50V 105C RADIAL ELECTROLYTIC CAPACITOR 5X11MM
C11    100u 100UF 35V 105C RADIAL ELECTROLYTIC CAPACITOR 6X11MM
C12    47u 47UF 25V 105C ALUMINUM ELECTROLYTIC CAPACITOR 5X11MM
C13    100n 100NF 0.1UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR

Diodes
D1    1N914 1N914 SMALL SIGNAL DIODE 200MA 100V
D2    1N914 1N914 SMALL SIGNAL DIODE 200MA 100V
D3    1N4001 1N4001 DIODE 1A 50V

Resistors
R1    1M 1M OHM 1/4W 1% METAL FILM RESISTOR
R2    1M 1M OHM 1/4W 1% METAL FILM RESISTOR
R3    1K 1K OHM 1/4W 1% METAL FILM RESISTOR
R4    560 560 OHM 1/4W 1% METAL FILM RESISTOR
R5    47 47 OHM 1/4W 1% METAL FILM RESISTOR
R6    1K 1K OHM 1/4W 1% METAL FILM RESISTOR
R7    1.5k 1.5K OHM 1/4W 1% METAL FILM RESISTOR
R8    1M 1M OHM 1/4W 1% METAL FILM RESISTOR
R9    10k 10K OHM 1/4W 1% METAL FILM RESISTOR
R10    47 47 OHM 1/4W 1% METAL FILM RESISTOR
R11    100k 100K OHM 1/4W 1% METAL FILM RESISTOR
R12    100k 100K OHM 1/4W 1% METAL FILM RESISTOR

Transistor and opamp
Q1    2N5458 2N5458 JFET N-CHANNEL TRANSISTOR
TL071    TL071 TL071 OPERATIONAL AMPLIFIER J-FET PDIP-8 TL071CP

Potentiometers
TONE    100k-A 100K OHM LOGARITHMIC TAPER POTENTIOMETER
VOL    100k-A 100K OHM LOGARITHMIC TAPER POTENTIOMETER
GAIN    100k-A 100K OHM LOGARITHMIC TAPER POTENTIOMETER

PCB Front

PCB Back

 

GENERAL DESCRIPTION OF COMPONENTS

Resistors

The resistors should be ¼ Watt metal type. You can either use a multimeter or the color bands to obtain their values. 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

The 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

The 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.

Tantalum capacitors

Tantalum capacitors have the value printed on them. The polarity is marked for the positive pin. Additionally, the longer leg is the positive and shorter the negative. Assemble the tantalum capacitor according to the positive polarity (+) marked on the PCB.

Integrated Circuits

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

Diodes

Diodes have their model printed on them. The polarity (cathode) is indicated by the ring near the side. This ring is also marked on the PCB.

Led diodes

Led diodes have polarity, the cathode is indicated as a flat surface on the side of the diode and also it is the shorter led. On the PCB, the cathode is marked as a flat side and anode as a round side.

Transistors

Transistors are three terminals components and their model is printed on them. To indicate the correct orientation, one side of the transistor is flat and the other one is round.

Potentiometers

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