Question: 2.3 An astable multi-vibrator (using 555 timer IC shown in Figure 2.3) generated an output waveform with a frequency of 720 Hz and a

2.3 An astable multi-vibrator (using 555 timer IC shown in Figure 2.3)

2.3 An astable multi-vibrator (using 555 timer IC shown in Figure 2.3) generated an output waveform with a frequency of 720 Hz and a duty cycle of 74.82%. +15V RA Reset Dis Re Trig Output %3D Threshold cuty Cyele = 74.82% 0.01uF Figure 2.3 () Calculate the value of tiow and thigh of the output waveform. (2 marks) (ii) Given that C 0.1uF, calculate and choose the standard E-24 value of resistor RA and Re of the 555 astable multi-vibrator to generate the output waveform. %3D (4 marks) (i) Sketch the voltage waveform (Ve) across the capacitor (C). Indicate on your sketch, all variables, different voltage levels of Vc, tiow and thigh. (4 marks) DEAEA (009783) -6- Sample Paper 2

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