#Rt9095 transistor schematic pro#

So the high harmonics above the fc selected by R TONE are attenuated like the graph below: The cut-off frequency is defined by the formula: All the interesting guitar signal will pass through, only harmonics below 7.2Hz will be attenuated. The 22nF cap C 1 blocks DC and provides simple high pass filtering.This input pull-down resistor becomes the maximum input impedance of the pedal. The 1M Ω input resistor R 1 next to the input jack to ground is a pull-down resistor, which avoids popping sounds when the pedal is switched on.Two diodes D 1 and D 2 will perform the hard clip action. The Clipping Amplifier is the core of the circuit, it is made of a non-inverting op-amp amplifier with variable voltage gain and some filters to shape the distortion response. Diode D 3 is placed for reverse polarity protection.

R10 47Ω resistor filter noise in power line, this low-value resistor together with the caps C 11 and C 12 will create a low pass filter which attenuates high-frequency impulse noise.

Caps C 11 and C 12 remove ripple from the 9V supply, the C 13 does the same in the 4.5V line.

Generating 4.5 volts using a simple voltage divider (R 11, R 12) to be used as virtual ground. The Power Supply stage provides 9V for the active circuits (op-amp and transistor). The different version/revisions use different substrates. It uses a single layer PCB with standard through-hole components which easily fits in the steel enclosure. The distortion stage is followed by a tone filter and an output buffer stage that ends up with a tone control. The distortion is produced using a variable gain circuit with diodes clipping the waveform. The design is based on the LM308 single op-amp.

#Rt9095 transistor schematic pro#

The Pro Co Rat circuit can be broken down into four simpler blocks: Power Supply, Clipper Amplifier, Tone Control and Output Stage: In 2008 production moved to China and is now manufactured by Neutrik for Pro Co Sound. The Pro Co Rat is a distortion pedal by Pro Co Sound designed by Scott Burnham and Steve Kiraly in Kalamazoo, Michigan 1978. The original circuit and appearance suffered some changes over the different revisions but the tone remained the same.ĭue to the pedal success there are several versions designed by Pro Co like the Juggernaut (1979), R2DU (1984), RAT2 (1988), Turbo RAT (1989), Vintage RAT (1991), BRAT (1997), Deucetone RAT (2002), Juggernaut Bass RAT (2003), You Dirty RAT (2004),'85 Whiteface RAT Reissue (2010).Īlthough the pedal was originally built as custom-order product in 1978, Pro Co began to mass produce it in 1979.