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 0.47UF 50V 105C RADIAL 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 ROUND SHAFT PC MOUNT
VOL    100k-A 100K OHM LOGARITHMIC TAPER POTENTIOMETER ROUND SHAFT PC MOUNT
GAIN    100k-A 100K OHM LOGARITHMIC TAPER POTENTIOMETER ROUND SHAFT PC MOUNT

PCB Front

PCB Back

 

GENERAL DESCRIPTION OF COMPONENTS

Resistors
The resistors are ¼ Watt metal type. You can either use a multimeter or the color bands to obtain their values. Resistors don’t have polarity; you can assemble them in any direction.

Electrolytic capacitors
Electrolytic capacitors have the value printed on them. The polarity is also is marked for the negative lead, additionally the longer leg is the positive and shorter the negative. Assemble the electrolytic capacitor according with the positive polarity (+) marked in the PCB, that is, the longer leg of the capacitor is passed through the pad marked with +.

Polyester capacitors
The polyester capacitors have three numbers, read as picofarads (pF), the first two are the 1st and 2nd digits and the third is the multiplier code. This type of capacitors doesn’t have polarity; you can assemble them in any direction.

 

Diodes

Diodes have their type number marked on them. This two terminals component has polarity; a ring near the side indicates the cathode. This ring is marked as a line to indicate the correct polarity in 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.

  

Integrated Circuits
Integrated Circuits have their name and model printed on them. A notch half-circle or a dot indicates the correct position that the IC needs to be assembled on the PCB.

 

Potentiometer
Potentiometers can be mounted directly on the PCB. For a correct orientation, the potentiometer shaft is marked on the PCB.

 

Transistors
Transistors are three terminals components and their model and name are printed on them. To indicate the correct assembling position one side of the transistor is flat and the other one is round, in the same way, the PCB is marked with round and flat side.