HELP in sequence of digits........

[chrysa82]

Hi all,
how can i create a circuit which give me the sequence 0001111100011111.....?
i have only a clock input and one output(1 bit).
Can anyone help me???

Thanks!!!
8O

 

[keith1200rs]

A three bit counter (or three flip-flops) and a few gates should do it - maybe even just one gate.

Keith.

 

[arthur0]

Hi.
Connect the clock input to a 3-bit counter whose outputs (Qa, Qb, Qc) select one of 8 inputs of a 8:1 multiplexer. The multiplexer's inputs are connectected to your desired pattern (such as A=0, B=0, C=0, D=1, E=1, F=1, G=1, H=1).
If you put everything in a black box, you'll only need to provide the clock while you present one output. Q.E.D.

Arthur

PS: Yeah, or as Keith suggested, you can do (Qa * Qb + Qc) with the counter's outputs instead of a Mux.

 

[djsfantasi]

I would investigate the use of shift registers; particularly a parallel load serial out shift register like a 74HC165. Download the datasheet and take a look at the pinouts - from there you should be able to easily create a circuit to do what you are asking.

 

[chrysa82]

Hi.
Connect the clock input to a 3-bit counter whose outputs (Qa, Qb, Qc) select one of 8 inputs of a 8:1 multiplexer. The multiplexer's inputs are connectected to your desired pattern (such as A=0, B=0, C=0, D=1, E=1, F=1, G=1, H=1).
If you put everything in a black box, you'll only need to provide the clock while you present one output. Q.E.D.

Arthur

PS: Yeah, or as Keith suggested, you can do (Qa * Qb + Qc) with the counter's outputs instead of a Mux.

thanks for your advise. it's very helpfull...Thank's a lot;-)