How It Works
The Pro Co "The RAT" is a distortion pedal with a very simple circuit, based around a single op-amp, the LM308. The distortion is produced using a variable gain circuit with diodes shorting the output to ground to produce hard clipping of the input waveform. This distortion stage is followed by a passive tone filter and volume control. This is the same scheme as the Boss DS-1 distortion pedal, although there are major differences between the two circuits, a major difference being the opamp used, the LM308, known for its poor slew rate, therefore the sound of the two pedals are different. The most popular RAT pedal, the RAT2, features true-bypass switching.
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