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question about flipflops and decoders

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evangeline

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please help me with these circuits:
a JK flipflop using a D flip flop and a multiplexer
a 5 to 32 decoder using four 3 to 8 decoders and a 2 to 4 decoder,
thanks, a picture would help more :wink:
 

mturna

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Hi JKFF can be design with a DFF, 2x1 mux and additonal INVERTER. You need an inverter, too.

(But I assume it is already inverted.) I will look to second part but it is a little bit longer if I can solve will reply again.
 

evangeline

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thnks 4 help... do you know how to make a counter to count from 0 to 9 and then from 9 to 0?
 

mturna

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Binary Counter
I think this will help you to understand operation and finish your work by adding 9 to 0 counting.
 

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