Clipping circuits are electronic circuits that limit or clip the amplitude of a signal to a certain level. They are used to prevent a signal from exceeding a certain level, which can cause distortion or damage to the circuit. Clipping circuits are commonly used in audio amplifiers, where they are used to prevent the output signal from exceeding the maximum voltage that the amplifier can handle. There are two types of clipping circuits: positive and negative. Positive clipping circuits limit the positive portion of the signal, while negative clipping circuits limit the negative portion of the signal. Clipping circuits can be implemented using diodes, transistors, or op-amps.