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Five JK flip-flops are cascaded to form the circuit shown in Figure. Clock pulses at a frequency of 1 MHz are applied as shown. The frequency (in kHz) of the waveform at Q3 is __________ .

  

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Given circuit is a Ripple (Asynchrnous) counter. In Ripple counter, o/p frequency of each flip-flop is half of the input frequency if their all the states are used otherwise o/p frequency of the counter is 

=  input frequency/modulus of the counter

So, the frequency at Q3 = input frequency/16

= ((1 x 106)/16)Hz = 62.5kHz 

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