Question: Clock pulses needed to control a digital. circuit is being generated by astble multivi bra:or which has rwo NAND gates,a 20MQ resistor and 100F

Clock pulses needed to control a digital. circuit is being generated by

Clock pulses needed to control a digital. circuit is being generated by astble multivi bra:or which has rwo NAND gates,a 20MQ resistor and 100F Capacitor. [8marks) [3marks] [2marks) ()Explain the need for an additional RS Flip-Flop at the output of the (i)Draw the NAND gate digital clock circuit. (ii) Calculate the frequency of the clock pulse. (iii) State the function of the resistor in the clock circuit. clock circuit. (2marks) (b) Explain the function of a digital Multiplexer ireuit shown in figurel [3marks] (c)Write the Boolean expression for the 4-to-1 digital Multiplexer with data input ABCD and address select (control) lines a and b in figure 1 [2marks) Page 1 of 3 Examiner: Mr. Agyare Debra "AVO gete *OR" gate Figure I ()

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