3.1 INTRODUCTION
A low-pass circuit is one which gives an appreciable output for low frequencies and zero or negligible output for high frequencies. In this chapter, we essentially consider low-pass RC and RL circuits and their responses to different types of inputs. Also, we study attenuators that reduce the magnitude of the signal to the desired level. Attenuators which give an output that is independent of frequency are studied. One application of such a circuit is as a CRO probe. Further, the response of the RLC circuit to step input is considered and its output under various conditions such as under-damped, critically damped and over-damped conditions is presented. The application of an RLC circuit as a ringing circuit is also considered. ...
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