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Pulse Generator

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Using one 555 timer, design a pulse generator that will have the following continuously variable ranges:

a) 0.1 kHz to 1kHz
b) 1kHz to 10kHz
c) 10kHz to 100kHz

A duty cycle of 0.5 is required. Use the same potentiometer for all the 3 ranges.

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Analyzing a Square wave in terms of sin components

A. A signal generator outputs a unipolar square wave with a period of 0.50 ms. The output of the generator is passed through an ideal low pass filter that has a cut off frequency of 4.5 kHz, to a spectrum analyzer. What frequencies would be seen on the spectrum analyzer screen?

b. The signal generator output in part (a) is changed to a rectangular pulse train in which the period is still 0.50 ms but the pulse length is 0.10 ms. What frequencies would be displayed on the spectrum analyzer screen?

c. The waveform output by the signal generator in part (b) is changed so that the rectangular pulses have the same width but no longer are periodic. They occur at random intervals of time. Explain in words how the display on the spectrum screen would change.

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